Add Github and Readthedocs links for all packages

[gerritholl]

On the packages overview page, add links to Github for all packages and Readthedocs for all packages that have documentation.

Packages that are on Github but not the package overview:

• [ ] python-bufr
• [ ] pygranule
• [ ] config-finder
• [ ] pyspectral-luts
• [ ] cis-troll-match
• [ ] pytroll
• [ ] pytroll-product-filter
• [ ] pytroll-examples
• [ ] satfire
• [ ] trollmoves
• [ ] trollflow2
• [ ] donfig
• [ ] pytroll-active-fire-runner

[djhoese]

Could you add a list of the packages that are missing (you could use github's markdown to make check boxes)?