Fix newsletter signup (firezone#1688)

New website (firezone#1629)

# Todo
- [x] NextJS boilerplate
- [x] Layout
  - [x] Flowbite react components
  - [x] footer
  - [x] docs layout
    - [x] max container width
    - [x] toggle sidebar (hamburger) on small screens
    - [x] sidebar search box
    - [x] fix sidebar chevrons
- [x] fix sidebar left margin for nested collapse (use className
directly)
  - [x] blog layout
    - [x] all articles
    - [x] single article
  - [x] marketing layout
    - [x] landing page / home
    - [x] fix contact / newsletter form
    - [x] reusable contact / sales form
    - [x] team page
- [ ] Content
  - [ ] Team Bios
  - [x] sitemap
  - [x] custom 404 and 500 pages
  - [x] favicon
  - [x] fix navbar link collapse on small devices
  - [x] customize `format`-enabled sections
  - [x] convert `<a>` to `<Link>`
  - [x] download images from githubusercontent
  - [x] fix TabsGroup styling
  - [x] fix Alert styling
  - [x] disable darkmode
  - [x] Add MDX support
  - [ ] ~~migrate blog/web/docs pages to React Components~~
  - [x] Replace Docusaurus components and MDX blocks with alternatives
- [x] CI
  - [x] Static analysis for ts/md(x)/js/css/html
  - [x] Build site to smoke test
  - [x] Rename `www` to `website`

## Saving for part 2
- [ ] Publish
- [x] Move from Github Pages to Vercel to avoid possible [usage policy
violations](https://docs.github.com/en/pages/getting-started-with-github-pages/about-github-pages#usage-limits)
  - [x] Add PostHog analytics
  - [ ] Update DNS records
  - [ ] Check Google search console
  - [ ] Check for JS errors
  - [x] Check page speed / optimization
  - [x] Reconfigure Algolia Docsearch

Be louder about Omnibus->Docker migration (firezone#1633)

Still getting some users tripping up on Omnibus issues, so I'm going to
cut a final 0.7.30 release, and then cut the CI pipeline that's building
and publishing those. Since all Omnibus installs are effectively
handicapped since 0.7.14-ish?

Use POST for connectivity check (firezone#1600)

Use POST for connectivity check

Fixes firezone#1576

Bump python action (firezone#1591)

Draft 1.0 signup (firezone#1581)

Setting 1.0 announcement to draft status for now.

Disable version updates for the mix ecosystem (firezone#1562)

This prevents noisy PRs that bump versions from being opened by
dependabot, instead [only allowing security updates
through](https://docs.github.com/en/code-security/dependabot/dependabot-security-updates/configuring-dependabot-security-updates#overriding-the-default-behavior-with-a-configuration-file).

Fix double slash in redirect URL redirect location (firezone#1515)

Closes firezone#1514

Use DEFAULT_ADMIN_EMAIL everywhere to prevent legacy key usage warnin…

…gs on fresh installs (firezone#1509)

Use ip link commands to check if interface or route should be added d…

…uring boot (firezone#1510)

Closes firezone#1506