Add proxy for Dask dashboard

[camposandro]

Add small section to Rubin docs on how to access dashboard on RSP.

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[github-actions]

Before [3e1f7b2]	After [bec53d0]	Ratio	Benchmark (Parameter)
935±3ms	959±10ms	1.03	benchmarks.time_create_midsize_catalog
6.33±0.01s	6.44±0.03s	1.02	benchmarks.time_create_large_catalog
23.6±0.5ms	23.8±0.5ms	1.01	benchmarks.time_box_filter_on_partition
80.3±1ms	80.6±1ms	1	benchmarks.time_kdtree_crossmatch
38.2±1ms	37.9±0.9ms	0.99	benchmarks.time_polygon_search

Click here to view all benchmarks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.64%. Comparing base (3e1f7b2) to head (5f1a910).
⚠️ Report is 121 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #969   +/-   ##
=======================================
  Coverage   95.64%   95.64%           
=======================================
  Files          54       54           
  Lines        2504     2504           
=======================================
  Hits         2395     2395           
  Misses        109      109           

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