chore: Clean up development guidelines.

[maniarathi]

Reviewers

Functional: @ebezzi

Readability: N/A

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Changes

Additions

• Added flake8 as a dependency in the dev requirements. Without this, the linter commands were failing.

Modifications

• Modified the top-level Makefile so that sections of commands were clearer.
• Moved information around in the developer guidelines to make the instructions more clear. Also removed outdated commands and deprecated information about annotations.

[codecov]

Codecov Report

Merging #253 (614dac4) into main (981cb3e) will not change coverage.
The diff coverage is n/a.

❗ Current head 614dac4 differs from pull request most recent head 425c2e9. Consider uploading reports for the commit 425c2e9 to get more accurate results

@@           Coverage Diff           @@
##             main     #253   +/-   ##
=======================================
  Coverage   76.47%   76.47%           
=======================================
  Files          92       92           
  Lines        6758     6758           
=======================================
  Hits         5168     5168           
  Misses       1590     1590           

Flag	Coverage Δ
frontend	76.47% <ø> (ø)
javascript	76.47% <ø> (ø)
smokeTest	?
unitTest	76.47% <ø> (ø)

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[MDunitz]

lgtm