Fix eumetsat urls in satpy/readers

[pdebuyl]

I "grepped" for eumetsat.int in satpy/readers and fixed the ones returning an error 404.

• Closes Broken links to new EUMETSAT website #1484
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[mraspaud]

Thanks a lot for the PR! always good to keep the documentation and the links up to date :)

[codecov]

Codecov Report

Merging #1827 (8cdf26b) into main (a6f26f3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1827   +/-   ##
=======================================
  Coverage   93.03%   93.03%           
=======================================
  Files         268      268           
  Lines       39625    39625           
=======================================
  Hits        36865    36865           
  Misses       2760     2760           

Flag	Coverage Δ
behaviourtests	4.72% <ø> (ø)
unittests	93.60% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
satpy/readers/mviri_l1b_fiduceo_nc.py	100.00% <ø> (ø)
satpy/readers/slstr_l1b.py	97.29% <ø> (ø)
satpy/readers/vii_l1b_nc.py	96.15% <ø> (ø)
satpy/readers/viirs_compact.py	76.04% <ø> (ø)

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[mraspaud]

@pdebuyl I'm waiting for the ci action to work again to merge this. Nothing we can do about it right now, except to wait for coveralls to fix its database as mentionned on our slack :)

[pdebuyl]

ok, thanks for the notice :-)

[sfinkens]

Thank you very much!

[ameraner]

Thank you for taking care of this!

[coveralls]

Coverage remained the same at 93.55% when pulling 8cdf26b on pdebuyl:fix_eumetsat_urls into a6f26f3 on pytroll:main.