Documentation for CO2 removal technologies in MESSAGE

[ywpratama]

This draft PR includes a proposal for the documentation of CO2 removal technologies in MESSAGE

How to review

When reviewing this draft PR, please provide feedback on the following but not limited to:

• Parent location of the doc. At the moment, it is put under emissions, but Energy section might be an option too.
• Now CDR technologies has its own section within the Emissions page. Please suggest whether this is appropriate or should it be moved under CO Emissions section
• This doc is planned to include other novel CDR technologies beyond those that are already included in the scenario MIP scenarios setup, so not only BECCS and DACCS. Please comment if this is OK or should we just put BECCS and DACCS for this.

PR checklist

• Continuous integration checks all ✅
• Add or expand tests; coverage checks both ✅
• Add, expand, or update documentation.
• Update doc/whatsnew.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.2%. Comparing base (8e13506) to head (450f896).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #531   +/-   ##
=====================================
  Coverage   74.2%   74.2%           
=====================================
  Files        320     320           
  Lines      25655   25655           
=====================================
  Hits       19047   19047           
  Misses      6608    6608           

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