maint: update README with newly rendered GIF

docs: include gh release command

fix: enable CGO so SQLite will work in the released build

chore: update release config to match countdown project setup

- Update .goreleaser.yml to use homebrew_casks with environment variables
- Configure to publish through topfunky/homebrew-tap repository
- Add CGO_ENABLED=0 and ldflags for version injection
- Update archive templates and checksum algorithm
- Update .github/workflows/release.yml to use HOMEBREW_TAP_TOKEN
- Simplify Go version to stable and GoReleaser to latest

docs: gif recording script for README.md

wip: add notes about recording a demo