override plugin links

[kecnry]

This PR overrides the links to jdaviz docs in plugins we inherit with those in the lcviz docs (which in turn can - and should - point to the upstream docs when appropriate).

Although not required to be released/pinned merge, this requires spacetelescope/jdaviz#2416 in order to see the overrides in the app, and #42 in order for all links to actually be built on the lcviz RTD.

I'll leave in draft until a decision is made on the jdaviz PR, but once that is merged, this can be merged and will just not be visible for anyone using an older version of jdaviz, and will eventually be visible to anyone once jdaviz 3.7 is released and pinned here.

Closes #9

[codecov]

Codecov Report

Patch coverage is 100.00% of modified lines.

Files Changed	Coverage
lcviz/helper.py	ø
lcviz/plugins/__init__.py	100.00%
lcviz/plugins/export_plot/__init__.py	100.00%
lcviz/plugins/export_plot/export_plot.py	100.00%
...z/plugins/frequency_analysis/frequency_analysis.py	100.00%
lcviz/plugins/markers/markers.py	100.00%
lcviz/plugins/metadata_viewer/__init__.py	100.00%
lcviz/plugins/metadata_viewer/metadata_viewer.py	100.00%
lcviz/plugins/plot_options/plot_options.py	100.00%
lcviz/plugins/subset_plugin/__init__.py	100.00%
... and 1 more

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