Write unified release documentation, move licenses into the root, and delete some unnecessary files from desktop/install

RELEASE.md

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+# OnionShare Release Process
+
+Unless you're a core OnionShare developer making a release, you'll probably never need to follow it.
+
+## Changelog, version, docs, and signed git tag
+
+Before making a release, you must update the version in these places:
+
+- [ ] `cli/pyproject.toml`
+- [ ] `cli/setup.py`
+- [ ] `cli/onionshare_cli/resources/version.txt`
+- [ ] `desktop/pyproject.toml` (under `version` and the `./onionshare_cli-$VERSION-py3-none-any.whl` dependency)
+- [ ] `desktop/src/setup.py`
+- [ ] `docs/source/conf.py`
+
+You also must edit these files:
+
+- [ ] `desktop/install/org.onionshare.OnionShare.appdata.xml` should have the correct release date, and links to correct screenshots
+- [ ] Update all of the documentation in `docs` to cover new features, including taking new screenshots if necessary.
+- [ ] In `snap/snapcraft.yaml`, the `tor`, `libevent`, and `obfs4` parts should be updated if necessary, and all python packages should be updated to match `cli/pyproject.toml` and `desktop/pyproject.toml`
+- [ ] `CHANGELOG.md` should be updated to include a list of all major changes since the last release
+- [ ] There must be a PGP-signed git tag for the version, e.g. for OnionShare 2.1, the tag must be `v2.1`
+
+The first step for the Linux, macOS, and Windows releases is the same.
+
+Verify the release git tag:
+
+```sh
+git fetch
+git tag -v v$VERSION
+```
+
+If the tag verifies successfully, check it out:
+
+```sh
+git checkout v$VERSION
+```
+
+## PyPi release
+
+The CLI version of OnionShare gets published on PyPi. To make a release:
+
+```sh
+cd cli
+poetry install
+poetry publish --build
+```
+
+## Linux Flatpak release
+
+See instructions for the Flatpak release here: https://github.com/micahflee/org.onionshare.OnionShare
+
+## Linux Snapcraft release
+
+You must have `snap` and `snapcraft` (`snap install snapcraft --classic`) installed.
+
+Build and test the snap before publishing:
+
+```sh
+snapcraft
+snap install --devmode ./onionshare_*.snap
+```
+
+Run the OnionShare snap:
+
+```sh
+/snap/bin/onionshare     # GUI version
+/snap/bin/onionshare.cli # CLI version
+```
+
+## Linux AppImage release
+
+_Note: AppImage packages are currently broken due to [this briefcase bug](https://github.com/beeware/briefcase/issues/504). Until it's fixed, OnionShare for Linux will only be available in Flatpak and Snapcraft._
+
+Build a wheel package for OnionShare CLI:
+
+```sh
+cd cli
+poetry install
+poetry build
+```
+
+This will make a file like `dist/onionshare_cli-$VERSION-py3-none-any.whl` (except with your specific version number). Move it into `../desktop/linux`:
+
+```sh
+mkdir -p ../desktop/linux
+mv dist/onionshare_cli-*-py3-none-any.whl ../desktop/linux
+# change back to the desktop directory
+cd ../desktop
+```
+
+Make sure the virtual environment is active, and then run briefcase create and briefcase build:
+
+```sh
+. venv/bin/activate
+briefcase create
+briefcase build
+```
+
+### Windows
+
+Build a wheel package for OnionShare CLI (including Tor binaries, from Tor Browser):
+
+```sh
+cd cli
+poetry install
+poetry build
+```
+
+This will make a file like `dist\onionshare_cli-$VERSION-py3-none-any.whl` (except with your specific version number). Move it into `..\desktop`:
+
+```
+move dist\onionshare_cli-*-py3-none-any.whl ..\desktop
+cd ..\desktop
+```
+
+Make sure the virtual environment is active, and then run `briefcase create`:
+
+```sh
+venv\Scripts\activate.bat
+briefcase create
+briefcase package
+```
+
+_TODO: Codesign_
+
+### macOS
+
+Build a wheel package for OnionShare CLI (including Tor binaries, from Tor Browser):
+
+```sh
+cd cli
+poetry install
+poetry build
+```
+
+This will make a file like `dist\onionshare_cli-$VERSION-py3-none-any.whl` (except with your specific version number). Move it into `..\desktop`:
+
+```
+cp dist/onionshare_cli-*-py3-none-any.whl ../desktop
+cd ../desktop
+```
+
+Make sure the virtual environment is active, and then run `briefcase create`:
+
+```sh
+. venv/bin/activate
+briefcase create
+briefcase package -i "Developer ID Application: Micah Lee"
+```