[docs] Build versions.json before mike deploy

[Varun-Dutta]

Changes

1. Moved code fore building versions.json before the mike deploy command
2. Copy the versions.json to S3, then switch to gh-pages to upload new version
3. Fixed typo in DJL_VERSION env in Copy files to S3 with the AWS CLI step

Rationale:
I re-ordered the steps so the workflow would crash if there was an issue with creating the versions.json file before building all the documentation. The code responsible for building the versions.json was unable to access the .toml file from gh-pages. Thus, I refactored the code to generate and upload the versions.json file before uploading the new website directory.

[frankfliu]

avoid using master branch for PR, better create a new branch

[frankfliu]

better move this into shell script

[frankfliu]

avoid use ./, the script should be able to execute in any directory

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.27%. Comparing base (d7c8a74) to head (30e5d7b).
Report is 3 commits behind head on master.

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HEAD has 1 upload less than BASE

Flag	BASE (d7c8a74)	HEAD (30e5d7b)
	3	2

Additional details and impacted files

@@              Coverage Diff              @@
##             master    #3392       +/-   ##
=============================================
- Coverage     72.86%   58.27%   -14.60%     
+ Complexity     7352     5740     -1612     
=============================================
  Files           668      668               
  Lines         32509    32509               
  Branches       3439     3439               
=============================================
- Hits          23688    18943     -4745     
- Misses         7207    12119     +4912     
+ Partials       1614     1447      -167     

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