plaid_update updates, docs, misc CI fixes

[jantman]

• Docker build - don't include -dirty in version/tag when building in GHA
• Document how to change Plaid environments
• GHA - Push built Docker images to Docker Hub, for builds of master branch
• Document triggering a Plaid update via the /plaid-update endpoint.
• Change /plaid-update endpoint argument name from account_ids to item_ids.
• Add num_days parameter support to /plaid-update endpoint.

[codecov-commenter]

Codecov Report

Merging #260 (4e6ee2a) into master (a818739) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #260      +/-   ##
==========================================
+ Coverage   50.37%   50.42%   +0.05%     
==========================================
  Files          82       82              
  Lines        5257     5263       +6     
  Branches      808      810       +2     
==========================================
+ Hits         2648     2654       +6     
  Misses       2556     2556              
  Partials       53       53              

Flag	Coverage Δ
acceptance	42.44% <14.28%> (-0.05%)	⬇️
unittests	47.15% <100.00%> (+0.06%)	⬆️

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

Impacted Files	Coverage Δ
biweeklybudget/flaskapp/views/plaid.py	100.00% <100.00%> (ø)
biweeklybudget/version.py	100.00% <100.00%> (ø)

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