Add mip to CMIP7 facets documentation page

[bouweandela]

Description

Add mip for CMIP7, as mentioned in #3017.

Link to documentation:

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Checklist

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• 🧪 The new functionality is relevant and scientifically sound
• 🛠 This pull request has a descriptive title and labels
• 🧪 and 🛠 Documentation is available
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• 🛠 All checks below this pull request were successful

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.70%. Comparing base (69f2019) to head (88fb65e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3019   +/-   ##
=======================================
  Coverage   95.70%   95.70%           
=======================================
  Files         267      267           
  Lines       15768    15768           
=======================================
  Hits        15090    15090           
  Misses        678      678           

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