Configured Navic and integrated it with Lualine. This provides context
about the code that is being worked on.
Also added a PAT to be able to create a PR when the Flake Update Github
action runs.
Updated some plugins to use custom git and diagnostic symbols, also
changed the line number color to match my system highlight color
(catppuccin peach).
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.
