Begin the adoption of monospaced fonts in the Dashboard

[filiptronicek]

Monospaced fonts are very cool for usage with things like version strings, code, commit hashes and so forth. Following @gtsiolis' idea, the goal is to format code-related elements in the Dashboard accordingly.

This idea also includes unifying the monospaced font stack to primarily use https://github.com/JetBrains/JetBrainsMono.

Progress tracking

For now, these are the following areas we would like to start adopting the font style:

• Commit hashes (e.g. the Prebuilds view)
• Branch names (e.g. the Prebuilds view)
• Version string (e.g. in the Preferences view)
  • Partially resolved by Introduce new version designs #15397

cc @gtsiolis