fix: reduce notification frequency and dismiss on click

feat: configure custom domain claudenotifier.com

Create CNAME

fix: replace em dash with hyphen in page title

feat: add landing page for GitHub Pages

chore: update changelog for v1.18.0

fix: address review feedback on update command

feat: add `claude-notifier update` command (closes #49)

fix: address review feedback on install scripts

chore: add install and uninstall scripts

feat: add curl | bash install script (closes #50)

chore: update changelog for v1.17.0

docs: add subtitle content option to README config menu

fix: handle spaced JSON and correct history.jsonl field names

feat: add configurable session context in notification subtitle