Link documentation of package with a main branch

• Adds documentation linking support for packages with a main branch.
• Removes gridtk from the tests as it moved out of the bob scope (Prefer auto-intersphinx to link your documentation).

assigned to @ydayer

enabled an automatic merge when the pipeline for 0f7b5490 succeeds

Meh. Sod it, I'm removing gridtk from the documentation-linking test.

Please use auto-intersphinx to link the documentation.

aborted the automatic merge because source branch was updated

added 1 commit

• d3890e2c - [tests] Remove gridtk from the tests of link-docs.

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added 1 commit

• 29d83344 - [doc] Fix link to bob.bio.base reference.

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changed the description

mentioned in commit 515404b0

merged