taffybar: refresh config and add helpers

- Remove stack config in favor of cabal/flake
- Add helper scripts for running/restarting and screenshots
- Update bar CSS/HS config

dotfiles/config/taffybar/scripts/taffybar-restart

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+
+pkill -u "$USER" -x taffybar || true
+
+cd "$root"
+setsid -f direnv exec . cabal run >/tmp/taffybar.log 2>&1
+
+echo "Started taffybar in the background. Logs: /tmp/taffybar.log"