Documentation of click based commands from docstrings

[PrajwalPrashanth]

• [x] Add sphinx click extension
• [x] Review and modify docstring contents(add helper texts)
• [x] Style Chnages
• [x] Test cli commands and modify examples

[codecov[bot]]

Codecov Report

Merging #182 into master will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #182   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           29        29           
  Lines         1356      1356           
=========================================
  Hits          1356      1356           

Flag	Coverage Δ
#unittests	100.00% <100.00%> (ø)

Impacted Files	Coverage Δ
jovian/cli.py	100.00% <100.00%> (ø)

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[PrajwalPrashanth]

@sidujjain Check this out its ready, local build is able to generate the page but there is some issue with ReadTheDocs and sphinx-click.

[PrajwalPrashanth]

@sidujjain changes are done. Here is the preview link https://prajwalprashanth-demo.readthedocs.io/en/pp-ch1321-cli-docs/api-reference/cli.html

[PrajwalPrashanth]

@sidujjain Order has been changed and [OPTIONS] is moved to last check it out https://prajwalprashanth-demo.readthedocs.io/en/pp-ch1321-cli-docs/api-reference/cli.html