plugins/lualine: fix duplicate diagnostic data

[horriblename]

closes #1810 and #1801

thanks @alexperreault

fully migrates lualine to setupOpts. Gets rid of option definitions that aren't that important. On the point of #1801, the theme names are "catppuccin-mocha" etc and not "catppuccin". I don't think there's any need to add more nix code to handle that, "auto" works just fine.

Sanity Checking

• I have updated the changelog as per my changes
• I have tested, and self-reviewed my code
• My changes fit guidelines found in hacking nvf
• Style and consistency
  • I ran Alejandra to format my code (nix fmt)
  • My code conforms to the editorconfig configuration of the project
  • My changes are consistent with the rest of the codebase
• If new changes are particularly complex:
  • My code includes comments in particularly complex areas
  • I have added a section in the manual
  • (For breaking changes) I have included a migration guide
• Package(s) built:
  • .#nix (default package)
  • .#maximal
  • .#docs-html (manual, must build)
  • .#docs-linkcheck (optional, please build if adding links)
• Tested on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin

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[github-actions]

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Debug Information

Triggered by: horriblename

HEAD at: lualine-fix-double-dia

Reruns: 4045

[alexperreault]

Tested on aarch64-darwin, works.

Thanks!