Add quilt3 login FAQ

[robnewman]

Description

Add quilt3 login to help users manage Quilt from containers like Docker

TODO

• [ x ] Changelog entry

[codecov[bot]]

Codecov Report

Merging #3099 (8cc43ac) into master (6dc9639) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3099   +/-   ##
=======================================
  Coverage   35.07%   35.07%           
=======================================
  Files         663      663           
  Lines       29044    29044           
  Branches     4278     4278           
=======================================
  Hits        10186    10186           
  Misses      17671    17671           
  Partials     1187     1187           

Flag	Coverage Δ
api-python	90.72% <ø> (ø)
catalog	8.46% <ø> (ø)
lambda	86.05% <ø> (ø)

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[drernie]

I defer to @akarve

[robnewman]

@akarve Suggested changes incorporated. Merged with latest master branch

[robnewman]

Had to remerge with latest master, so needs another review

[robnewman]

Abandoning branch. These changes were applied in another branch