feat: add sentry error tracking

[marionebl]

Proposed Changes

Add sentry.io error tracking so we can gather data about issues of recent releases and unknown bugs to search for based on recurring exceptions.

Related: #153

ToDo

• [ ] Update privacy policy on website

Done

• [x] Check GDPR concerns
• [x] Let users send their reports to GitHub and sentry
• [x] Decide if we need to let users opt in/out of this - Will opt in
• [x] Find out if there is an team OSS plan for sentry.io (yes 🎉 )

Later

• [ ] Wire up the crash reporter
• [ ] Pass release information
• [ ] Upload release information from CI
• [ ] Upload source maps from CI

[marionebl]

Deployed at: https://alva-issues-703.surge.sh

[marionebl]

Deployed at: https://alva-site-issues-703.surge.sh