chore: tidy comments that repeat the code or no longer match it (#72)

- Comments that only restate a name (sgr, fg, mdLink, the repo provider's starred and current-repo notes) are gone.
- Stale ones match the code again: the repo package covers plain env files too, Launch runs argv, closeVersions no longer claims to move the cursor, and Check's fallback says why rather than naming a state no release had.
- The doc for versionString was attached to pseudo; the backtick in SourcesView's doc was a string-concatenation leftover; openFailed's doc was garbled.
- recentReleases sits next to latest, its user.
- .gitignore drops the Go template's boilerplate and patterns for files this project doesn't make.

Reviewed-on: #72
Co-authored-by: Karl-Einar Bergstrøm <karl-einarb@outlook.com>

internal/ui/app/app.go

@@ -1319,8 +1319,7 @@ func (m *Model) countVersions(o provider.Object) tea.Cmd {
 	})
 }
 
-// closeVersions returns the Secrets pane to the object list, with the
-// cursor on the object whose versions were shown.
+// closeVersions returns the Secrets pane to the object list.
 func (m *Model) closeVersions() {
 	m.versionsOf = nil
 }