[HOTFIX] I152 change django port to 8081 and fix .env.example

[jsun1590]

Change Summary

[Briefly summarise the changes that you made. Just high-level stuff]

• Revert default Django port to 8081
• fix .env.example missing closing "

Change Form

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• The pull request title has an issue number
• The change works by "Smoke testing" or quick testing
• The change has tests
• The change has documentation

Other Information

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Related issue

• Resolve hotfix: revert default Django port and fix .env.example #152

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[codecov-commenter]

Codecov Report

Merging #153 (44cecde) into main (65ab55a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #153   +/-   ##
=======================================
  Coverage   89.86%   89.86%           
=======================================
  Files          34       34           
  Lines         523      523           
=======================================
  Hits          470      470           
  Misses         53       53           

Flag	Coverage Δ
backend	89.86% <100.00%> (ø)

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

Impacted Files	Coverage Δ
server/api/settings.py	100.00% <100.00%> (ø)

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