Fewer links means less confusion.
- Merge doom-issue and doom-commit links into doom-ref (for auto-linking
Issue/PR/commit references).
- Merge doom-module-source and doom-docs-source links into doom-source.
- Rename doom-report-issue to doom-report.
- Use '!' as the icon for module issues link.
- Remove doom-repo (replaced with "doom:*" in :lang org module).
- Add doomdir and emacsdir links to :lang org module.
From brotzeit/rustic@da3820d
Due to changes upstream, users can no longer use lsp-rust-server to
switch to rust-analyzer with rustic-mode. Use rustic-lsp-server instead.
Trying to install with cargo fails with the following error:
```
Caused by:
failed to run custom build command for `clippy v0.0.302`
Caused by:
process didn't exit successfully: `/var/folders/66/180ynjt55z74l338gh0stq0c0000gn/T/cargo-installkNqJBB/release/build/clippy-bcde765a4c9acf93/build-script-build` (exit code: 1)
--- stderr
error: Clippy is no longer available via crates.io
help: please run `rustup component add clippy-preview` instead
```
