Remove Django Admin in production mode

[lkbhitesh07]

Summary

Description of the change(s) you made

To not run django in production mode I have made some changes in settings file as I added condition to it and done some changes in URL file too.

Does this introduce any tech-debt items?

Issue - #3016

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Reviewer guidance

How can a reviewer test these changes?

We can simply check if we can access the admin panel in production mode.

References

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Contributor's Checklist

PR process:

• If this is an important user-facing change, PR or related issue the CHANGELOG label been added to this PR. Note: items with this label will be added to the CHANGELOG at a later time
• If this includes an internal dependency change, a link to the diff is provided
• The docs label has been added if this introduces a change that needs to be updated in the user docs?
• If any Python requirements have changed, the updated requirements.txt files also included in this PR
• Opportunities for using Google Analytics here are noted
• Migrations are safe for a large db

Studio-specifc:

• All user-facing strings are translated properly
• The notranslate class been added to elements that shouldn't be translated by Google Chrome's automatic translation feature (e.g. icons, user-generated text)
• All UI components are LTR and RTL compliant
• Views are organized into pages, components, and layouts directories as described in the docs
• Users' storage used is recalculated properly on any changes to main tree files
• If there new ways this uses user data that needs to be factored into our Privacy Policy, it has been noted.

Testing:

• Code is clean and well-commented
• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Any new interactions have been added to the QA Sheet
• Critical and brittle code paths are covered by unit tests

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Reviewer's Checklist

This section is for reviewers to fill out.

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[rtibbles]

Nearly there, can simplify the fix.

[codecov]

Codecov Report

Merging #3027 (c59593b) into hotfixes (deb4663) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           hotfixes    #3027      +/-   ##
============================================
- Coverage     85.73%   85.71%   -0.02%     
============================================
  Files           298      298              
  Lines         15876    15879       +3     
============================================
  Hits          13611    13611              
- Misses         2265     2268       +3     

Impacted Files	Coverage Δ
contentcuration/contentcuration/settings.py	90.62% <ø> (ø)
contentcuration/contentcuration/urls.py	95.16% <ø> (ø)
...uration/contentcuration/tests/test_urlendpoints.py	93.75% <0.00%> (-2.09%)	⬇️
contentcuration/contentcuration/tasks.py	62.72% <0.00%> (-0.54%)	⬇️

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[radinamatic]

Tested and not found! 😛