small updates to models/(admin|help), added testing for models/admin, migrated testing for models/help to midje

[gkspranger]

• added (comment) and doc strings to models/admin
• expanded to arity/2 for 2 functions in models/admin to allow for testing,, original function signatures (arity/1) passes in (config) to expanded arity/2
• destructuring in (let) for (user-is-admin?) arity/2 to make editor happy when retrieving doc string
• made kondo happy for models/help, as well as added doc string for (remove-docs)
• updated test/README for some REPL pointers when wanting to exercise code that relies on instance config
• added midje tests for models/admin
• migrated tests for models/help to midje, as well as adding one more

FYI -- i "fixed" and committed the tests with lein cljfmt -- to see what the result would be .. didn't want to assume "this is the way", so did not commit plugin to project.clj -- but thought i would share the result for reference

[codecov[bot]]

Codecov Report

Merging #166 (4ae534b) into master (2c1d4b7) will increase coverage by 0.10%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #166      +/-   ##
==========================================
+ Coverage   46.92%   47.03%   +0.10%     
==========================================
  Files          94       94              
  Lines        4134     4142       +8     
  Branches      195      195              
==========================================
+ Hits         1940     1948       +8     
  Misses       1999     1999              
  Partials      195      195              

Impacted Files	Coverage Δ
src/yetibot/core/models/admin.clj	82.35% <100.00%> (+15.68%)	:arrow_up:
src/yetibot/core/models/help.clj	93.02% <100.00%> (ø)

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