v0.2.0: The path towards a stable Recipe format

Lots of good work in the release towards making the recipe format more usable.

What's Changed

• Update installation instructions to use conda and add missing operators to documentation by @jfrost-mo in #94
• Update index.rst by @Sylviabohnenstengel in #95
• Improve installation instructions by @jfrost-mo in #97
• Use speedy libmamba when resolving conda environments by @jfrost-mo in #105
• Add documentation on rational by @jfrost-mo in #102
• Relax version requirement for sphinx by @jfrost-mo in #108
• Run PR checks on push to main by @jfrost-mo in #109
• Move to YAML recipe format by @jfrost-mo in #119
• Lock pre-commit config to specific SHA by @jfrost-mo in #118
• Use recipes from environment variable by @jfrost-mo in #122

Full Changelog: v0.1.1...v0.2.0