Update Windows docs

- Remove deprecated external redirects
- Add YAML headers
- Fix headings
- Improve naming scheme
- Make permalinks consistent with names
- Fix titles
- Add redirects
- Use preferred heading syntax
- Fix image embeds
- Use relative links for internal links
- Update links

external/os-guides/windows/windows-tools.md

@@ -1,18 +0,0 @@
----
-lang: en
-layout: doc
-redirect_from:
-- /doc/windows-tools/
-- /doc/windows-appvms/
-- /en/doc/windows-appvms/
-- /doc/WindowsAppVms/
-- /wiki/WindowsAppVms/
-- /doc/windows-tools-3/
-- /en/doc/windows-tools-3/
-- /doc/WindowsTools3/
-- /doc/WindowsTools/
-- /wiki/WindowsTools/
-redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/os/windows/windows-tools.md
-ref: 86
-title: Qubes Windows tools
----

external/os-guides/windows/windows-vm.md

@@ -1,9 +0,0 @@
----
-lang: en
-layout: doc
-redirect_from:
-- /doc/windows-vm/
-redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/os/windows/windows-vm.md
-ref: 85
-title: Installing a Windows qube
----

external/os-guides/windows/windows.md

@@ -1,9 +0,0 @@
----
-lang: en
-layout: doc
-redirect_from:
-- /doc/windows/
-redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/os/windows/windows.md
-ref: 129
-title: Windows qubes
----