Run `nix fmt` at the root of the repository to format all files. I've
done this on my fork and this will help me merge your changes later
without having to deal with un-formatted files.
Added Markdown Preview and the Obsidian plugins.
Updated the Startup screen with links to Github Copilot and Obsidian
Moved the helm-vim plugin from a seperate file into the lsp.nix file.
