docs: update local dev steps, unify permissions in config

[bobheadxi]

Pull Request

Description

Give a brief description of your changes:

Working my way through the local dev guide and a few things have changed on the Slack side of things

Testing

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Ticket(s)

n/a

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and replace "Affects" with "Closes" if merging this will close the relevant ticket.)

[codecov]

Codecov Report

Merging #485 into master will not change coverage.
The diff coverage is n/a.

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##           master     #485   +/-   ##
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  Coverage   94.83%   94.83%           
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  Files          44       44           
  Lines        2403     2403           
  Branches      303      303           
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  Hits         2279     2279           
  Misses         80       80           
  Partials       44       44           

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[chuck-sys]

Looks good in general. But man do the docs need updating. We also might need to update recommendations on dev practices (that may or may not coincide with "best practices) regarding running using docker vs pipenv, and how docker may or may not interact badly with local ddb.

[chuck-sys]

lgtm