admin bulk DM tool

[owocki]

Description

a simple admin tool to send bulk DMs on gitcoin chat. useful for getting the word out in a personalized, but secretly automated, way.

Refers/Fixes

https://gitcoincore.slack.com/archives/CSE21LF9P/p1590121390180800

Testing

[codecov]

Codecov Report

Merging #6731 into master will increase coverage by 0.17%.
The diff coverage is 3.12%.

@@            Coverage Diff             @@
##           master    #6731      +/-   ##
==========================================
+ Coverage   26.67%   26.84%   +0.17%     
==========================================
  Files         293      293              
  Lines       27817    29403    +1586     
  Branches     4109     4620     +511     
==========================================
+ Hits         7420     7894     +474     
- Misses      20132    21192    +1060     
- Partials      265      317      +52     

Impacted Files	Coverage Δ
app/app/urls.py	83.07% <ø> (-3.13%)	⬇️
app/dashboard/views.py	10.56% <3.12%> (-0.20%)	⬇️
app/quests/views.py	16.22% <0.00%> (ø)
...rketing/management/commands/no_applicants_email.py	0.00% <0.00%> (ø)
app/marketing/admin.py	84.41% <0.00%> (+0.20%)	⬆️
app/marketing/models.py	64.42% <0.00%> (+0.37%)	⬆️
app/marketing/views.py	12.09% <0.00%> (+0.44%)	⬆️
app/dashboard/models.py	50.17% <0.00%> (+0.86%)	⬆️
... and 6 more

---

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[thelostone-mc]

@owocki you good with us purging the whitepaper code + data ?
If it's not shown anywhere on the site -> might as well shed off that extra code + data

[owocki]

can this go in next weeks release, since its greenfield? @vs77bb wants to play with it