chore(git): untrack the generated dunst, conky and homepage configsHEADmaster

All three are written by udt-palette and rewritten by every install, so
each scheme switch showed them as modified. dunstrc and conky.conf were
already in .gitignore and tracked anyway, which does nothing: the ignore
list is not consulted for files already in the index. homepage's
custom.css was missing from the list entirely.

Add the missing entry and drop all three from the index. AGENTS.md
already documents them as generated and gitignored, so this makes the
repo match what it says.

Verified all three regenerate from an absent file.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0176XsV85ByN2ee7HseUKcqA

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