* Fix some documentation for element-desktop
Some of these links got broken, or outdated, during the monorepo switch.
* Fix desktop docker build script
It will fail with 'workspace_node_modules: no such file or directory' if the
directory does not exist.
This got broken by https://github.com/element-hq/element-web/pull/33641.
* Clarify native modules doc
Most of this stuff does not apply when using the docker build.
* update snapshot