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Tidy links, and lint (#2435)

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Tidies up a number of things:

- Outdated links that redirect
- Dead links
- Remove unnecessary parameters eg "en" and "en-US"
- Shortened amazon, apps.apple.com, reddit links
- Removed trailing /
- Remove www (except for PG assets)
- Optimize unoptimized SVGs and remove xml declarations
- Lint yaml, md files

Co-Authored-By: Daniel Gray <dngray@privacyguides.org>
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docs/basics/multi-factor-authentication.md
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@ -29,7 +29,7 @@ TOTP is one of the most common forms of MFA available. When you set up TOTP, you
The time-limited code is then derived from the shared secret and the current time. As the code is only valid for a short time, without access to the shared secret, an adversary cannot generate new codes.
If you have a hardware security key with TOTP support (such as a YubiKey with [Yubico Authenticator](https://www.yubico.com/products/yubico-authenticator/)), we recommend that you store your "shared secrets" on the hardware. Hardware such as the YubiKey was developed with the intention of making the "shared secret" difficult to extract and copy. A YubiKey is also not connected to the Internet, unlike a phone with a TOTP app.
If you have a hardware security key with TOTP support (such as a YubiKey with [Yubico Authenticator](https://yubico.com/products/yubico-authenticator)), we recommend that you store your "shared secrets" on the hardware. Hardware such as the YubiKey was developed with the intention of making the "shared secret" difficult to extract and copy. A YubiKey is also not connected to the Internet, unlike a phone with a TOTP app.
Unlike [WebAuthn](#fido-fast-identity-online), TOTP offers no protection against [phishing](https://en.wikipedia.org/wiki/Phishing) or reuse attacks. If an adversary obtains a valid code from you, they may use it as many times as they like until it expires (generally 60 seconds).
@ -121,13 +121,13 @@ Beyond just securing your website logins, multi-factor authentication can be use
### Windows
Yubico has a dedicated [Credential Provider](https://docs.microsoft.com/en-us/windows/win32/secauthn/credential-providers-in-windows) that adds Challenge-Response authentication for the username + password login flow for local Windows accounts. If you have a YubiKey with Challenge-Response authentication support, take a look at the [Yubico Login for Windows Configuration Guide](https://support.yubico.com/hc/en-us/articles/360013708460-Yubico-Login-for-Windows-Configuration-Guide), which will allow you to set up MFA on your Windows computer.
Yubico has a dedicated [Credential Provider](https://learn.microsoft.com/windows/win32/secauthn/credential-providers-in-windows) that adds Challenge-Response authentication for the username + password login flow for local Windows accounts. If you have a YubiKey with Challenge-Response authentication support, take a look at the [Yubico Login for Windows Configuration Guide](https://support.yubico.com/hc/articles/360013708460-Yubico-Login-for-Windows-Configuration-Guide), which will allow you to set up MFA on your Windows computer.
### macOS
macOS has [native support](https://support.apple.com/guide/deployment/intro-to-smart-card-integration-depd0b888248/web) for authentication with smart cards (PIV). If you have a smartcard or a hardware security key that supports the PIV interface such as the YubiKey, we recommend that you follow your smartcard/hardware security vendor's documentation and set up second factor authentication for your macOS computer.
Yubico have a guide [Using Your YubiKey as a Smart Card in macOS](https://support.yubico.com/hc/en-us/articles/360016649059) which can help you set up your YubiKey on macOS.
Yubico have a guide [Using Your YubiKey as a Smart Card in macOS](https://support.yubico.com/hc/articles/360016649059) which can help you set up your YubiKey on macOS.
After your smartcard/security key is set up, we recommend running this command in the Terminal:
@ -146,22 +146,22 @@ If the hostname of your system changes (such as due to DHCP), you would be unabl
</div>
The `pam_u2f` module on Linux can provide two-factor authentication for logging in on most popular Linux distributions. If you have a hardware security key that supports U2F, you can set up MFA authentication for your login. Yubico has a guide [Ubuntu Linux Login Guide - U2F](https://support.yubico.com/hc/en-us/articles/360016649099-Ubuntu-Linux-Login-Guide-U2F) which should work on any distribution. The package manager commands—such as `apt-get`—and package names may however differ. This guide does **not** apply to Qubes OS.
The `pam_u2f` module on Linux can provide two-factor authentication for logging in on most popular Linux distributions. If you have a hardware security key that supports U2F, you can set up MFA authentication for your login. Yubico has a guide [Ubuntu Linux Login Guide - U2F](https://support.yubico.com/hc/articles/360016649099-Ubuntu-Linux-Login-Guide-U2F) which should work on any distribution. The package manager commands—such as `apt-get`—and package names may however differ. This guide does **not** apply to Qubes OS.
### Qubes OS
Qubes OS has support for Challenge-Response authentication with YubiKeys. If you have a YubiKey with Challenge-Response authentication support, take a look at the Qubes OS [YubiKey documentation](https://www.qubes-os.org/doc/yubikey/) if you want to set up MFA on Qubes OS.
Qubes OS has support for Challenge-Response authentication with YubiKeys. If you have a YubiKey with Challenge-Response authentication support, take a look at the Qubes OS [YubiKey documentation](https://qubes-os.org/doc/yubikey) if you want to set up MFA on Qubes OS.
### SSH
#### Hardware Security Keys
SSH MFA could be set up using multiple different authentication methods that are popular with hardware security keys. We recommend that you check out Yubico's [documentation](https://developers.yubico.com/SSH/) on how to set this up.
SSH MFA could be set up using multiple different authentication methods that are popular with hardware security keys. We recommend that you check out Yubico's [documentation](https://developers.yubico.com/SSH) on how to set this up.
#### Time-based One-time Password (TOTP)
SSH MFA can also be set up using TOTP. DigitalOcean has provided a tutorial [How To Set Up Multi-Factor Authentication for SSH on Ubuntu 20.04](https://www.digitalocean.com/community/tutorials/how-to-set-up-multi-factor-authentication-for-ssh-on-ubuntu-20-04). Most things should be the same regardless of distribution, however the package manager commands—such as `apt-get`—and package names may differ.
SSH MFA can also be set up using TOTP. DigitalOcean has provided a tutorial [How To Set Up Multi-Factor Authentication for SSH on Ubuntu 20.04](https://digitalocean.com/community/tutorials/how-to-set-up-multi-factor-authentication-for-ssh-on-ubuntu-20-04). Most things should be the same regardless of distribution, however the package manager commands—such as `apt-get`—and package names may differ.
### KeePass (and KeePassXC)
KeePass and KeePassXC databases can be secured using Challenge-Response or HOTP as a second-factor authentication. Yubico has provided a document for KeePass [Using Your YubiKey with KeePass](https://support.yubico.com/hc/en-us/articles/360013779759-Using-Your-YubiKey-with-KeePass) and there is also one on the [KeePassXC](https://keepassxc.org/docs/#faq-yubikey-2fa) website.
KeePass and KeePassXC databases can be secured using Challenge-Response or HOTP as a second-factor authentication. Yubico has provided a document for KeePass [Using Your YubiKey with KeePass](https://support.yubico.com/hc/articles/360013779759-Using-Your-YubiKey-with-KeePass) and there is also one on the [KeePassXC](https://keepassxc.org/docs/#faq-yubikey-2fa) website.