Add link to 'well-done' packages

[tdegeus]

I think that it would be a good idea to add some links in the knowledge-base to 'well-done' feedstocks for a certain application. In particular (list to be extended)

• multi-output
• Python API compilation with pybind11

This would allow debugging by 'stealing' others' solutions.

[xhochy]

• Multi-output and cross-compiled with meson (and calling itself during the build): https://github.com/conda-forge/glib-feedstock
• Cross-compiled with CMake (and calling itself during the build) https://github.com/conda-forge/gobject-introspection-feedstock

[ocefpaf]

We should get rid of the example in staged-recipes and add that list to the docs and readme. Covering also:

• noarch
• compiled extenstion
• python and r (most common langs)
• modern glibc and other special configs that needs to go into the conda-forge.yml file