Function reference restructuring

[szhorvat]

@maelle, these are some notes I had sitting on my hard drive, which you might find helpful when restructuring the sections of the function reference. Obviously, this should not be merged. A PR was just an easy way to share the notes. Feel free to use it any way you like, or ignore it.

[codecov]

Codecov Report

Merging #660 (7804473) into main (4147c29) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 7804473 differs from pull request most recent head b5a148e. Consider uploading reports for the commit b5a148e to get more accurate results

@@           Coverage Diff           @@
##             main     #660   +/-   ##
=======================================
  Coverage   62.70%   62.70%           
=======================================
  Files          73       73           
  Lines       21571    21571           
=======================================
  Hits        13526    13526           
  Misses       8045     8045           

Impacted Files	Coverage Δ
src/rinterface.c	79.24% <100.00%> (ø)

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[maelle]

Thank you, this is helpful! See #662

[szhorvat]

Happy that I could help. This is just a starting point, feel free to do additional restructuring as you see fit.