chore: tidy comments that repeat the code or no longer match it

- 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.

internal/config/config.go

@@ -47,7 +47,8 @@ type UI struct {
 	// RecentIcon marks items used lately (Recent, R) with ◷, in the lists
 	// and in lazysecrets list. Defaults to false.
 	RecentIcon *bool `yaml:"recentIcon"`
-	// SourcesView is "grouped" (default) or "flat"; ` + "`" + ` toggles it.
+	// SourcesView is "grouped" (default) or "flat"; the backtick key
+	// toggles it.
 	SourcesView string `yaml:"sourcesView"`
 	// CollapseGroups starts the Sources pane with its groups folded;
 	// defaults to true.