Final touches of Call For Proposals feature

[alysivji]

Complete #300

What does this do

After testing the feature, adding a few niceties:

• CRON job to post upcoming CFPs
• remove button to improve settings interface

Why are we doing this

Improving feature

How should this be tested

n/a

Migrations

n/a

Dependencies

n/a

Callouts

n/a

[codecov-commenter]

Codecov Report

Merging #328 into master will decrease coverage by 0.18%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master     #328      +/-   ##
==========================================
- Coverage   89.97%   89.79%   -0.19%     
==========================================
  Files          71       71              
  Lines        2474     2488      +14     
==========================================
+ Hits         2226     2234       +8     
- Misses        248      254       +6     

Impacted Files	Coverage Δ
busy_beaver/apps/call_for_proposals/forms.py	78.57% <57.14%> (-21.43%)	⬇️

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