MAINT: Update service links, and fix broken ones in docs

[bsipocz]

There are still quite a few redirects picked up by the linkchecker, as well as a few broken ones. And some of the achors seem to be not working either, however they do when copy-pasted into the browser.

[codecov]

Codecov Report

Merging #2744 (3f8e5d1) into main (ead1b13) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2744   +/-   ##
=======================================
  Coverage   66.05%   66.05%           
=======================================
  Files         233      233           
  Lines       17925    17925           
=======================================
  Hits        11840    11840           
  Misses       6085     6085           

Impacted Files	Coverage Δ
astroquery/cosmosim/__init__.py	100.00% <ø> (ø)
astroquery/ipac/ned/__init__.py	100.00% <ø> (ø)
astroquery/jplhorizons/__init__.py	100.00% <ø> (ø)
astroquery/nasa_ads/core.py	82.66% <ø> (ø)
astroquery/sdss/core.py	92.97% <ø> (ø)
astroquery/vizier/__init__.py	100.00% <ø> (ø)
astroquery/ipac/ned/core.py	88.37% <100.00%> (ø)
astroquery/vizier/core.py	78.59% <100.00%> (ø)

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[bsipocz]

Let's get these in as I don't have time atm to hunt down all the remaining ones (~80)