Improve settings workflow

[alysivji]

What does this do

• fix typo in settings
• show settings command when user enters /busybeaver help
• GitHub Summary Feature settings page shows how to publicize bot

Why are we doing this

Improve user experience

How should this be tested

Added tests around functionality we added; removed other tests

Migrations

n/a

Dependencies

• remove user scopes for channel:read and groups:read
  • [x] staging
  • [x] production

Callouts

n/a

[codecov-commenter]

Codecov Report

Merging #329 into master will increase coverage by 0.13%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #329      +/-   ##
==========================================
+ Coverage   89.79%   89.92%   +0.13%     
==========================================
  Files          71       71              
  Lines        2488     2491       +3     
==========================================
+ Hits         2234     2240       +6     
+ Misses        254      251       -3     

Impacted Files	Coverage Δ
...sy_beaver/apps/slack_integration/oauth/workflow.py	73.68% <ø> (+3.19%)	:arrow_up:
busy_beaver/apps/web/views.py	67.01% <ø> (ø)
...eaver/apps/slack_integration/event_subscription.py	96.34% <100.00%> (+0.04%)	:arrow_up:
busy_beaver/apps/slack_integration/interactors.py	100.00% <100.00%> (ø)
...usy_beaver/apps/slack_integration/slash_command.py	90.43% <100.00%> (+0.08%)	:arrow_up:
busy_beaver/common/wrappers/slack.py	95.16% <100.00%> (ø)

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