feat: testable book-of-bdk

[realeinherjar]

• Automated CI in GitHub Actions that test all the code in the cookbook: .github/workflows/test.yml
• Automated scheduled CI in GitHub Actions that check all markdown files for broken links (we are adding a LOT of links): .github/workflows/check-links.yml
• Dependabot to update (weekly) .github/dependabot.yml:
  • GitHub Actions
  • Test dependencies, this is good once we release bdk new versions (and move from the git versions to releases of the crates) dependabot will open a PR here to update
• justfile to easy run the build and test with just
• Make book/wallet.md testable.

Details

I want this cookbook to be tested automatically on CI, so the code will always run.
The only solution that worked for me was this workaround that is used in The Rust Rand Book.

Also some code blocks I don't want to test, but I wanted syntax highlighting.
An easy fix was to change the language on the fenced blocks from rust to rs.
This makes Vitepress render them as Rust, but they are untouched by ./tests/generate.sh and cargo test.

[realeinherjar]

Ready to review

[thunderbiscuit]

ACK 7587fce.