Add `--generate-link-to-definition` option when building on docs.rs

[GuillaumeGomez]

This option generates links in source code pages, allowing to jump to definition and to jump back to doc. It makes browsing the source code pages much nicer. You can see it in action here.

[codecov[bot]]

Codecov Report

Merging #600 (0c3c051) into main (cbf1349) will decrease coverage by 0.0%. The diff coverage is n/a.

@@           Coverage Diff           @@
##            main    #600     +/-   ##
=======================================
- Coverage   95.8%   95.8%   -0.0%     
=======================================
  Files         79      79             
  Lines       8927    8905     -22     
=======================================
- Hits        8552    8530     -22     
  Misses       375     375             

see 5 files with indirect coverage changes

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[jhpratt]

Thanks!