Add task-oriented recipes page to the docs

[Copilot]

The roadmap calls for task-oriented documentation recipes, but the docs currently skew toward reference material and broad examples. This PR adds a focused recipes page with copy/paste workflows for common operator and contributor tasks.

• New documentation surface

  • Adds docs/recipes.md as a dedicated task-oriented guide
  • Covers common workflows:
    • verify environment/login
    • inspect a course before changes
    • create a course and add a welcome label
    • upload materials into a folder
    • run the fastest contributor validation loop

• Navigation

  • Registers the new page in mkdocs.yml so it is discoverable from the top-level docs nav

• Docs shape

  • Positions recipes between examples and troubleshooting:
    • examples remain illustrative
    • recipes are operational and copy/paste-ready
    • troubleshooting remains failure-oriented

Example recipe:

py-moodle --env local site info

py-moodle courses list
py-moodle courses show 2
py-moodle sections list 2

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