handle non-metamask web3 browsers

[owocki]

Description

This PR makes it so that the frontend fails gracefully for non web3 browsers

Refers/Fixes

Testing and Sign-off

Self; I think @ceresstation was asking for help on this back when he was trying to get Aragon support enabled too!

[codecov]

Codecov Report

Merging #4143 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4143      +/-   ##
==========================================
- Coverage   30.26%   30.24%   -0.02%     
==========================================
  Files         206      206              
  Lines       16367    16375       +8     
  Branches     2154     2163       +9     
==========================================
  Hits         4953     4953              
- Misses      11238    11244       +6     
- Partials      176      178       +2

Impacted Files	Coverage Δ
app/dashboard/router.py	30.25% <0%> (-0.1%)	⬇️
app/app/urls.py	90% <0%> (ø)	⬆️
app/retail/views.py	29.39% <0%> (ø)	⬆️
app/avatar/utils.py	13.43% <0%> (ø)	⬆️
app/marketing/views.py	12.3% <0%> (+0.07%)	⬆️

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[octavioamu]

LGTM

[thelostone-mc]

Thanks @owocki ! Glad to have you contributing :) ( sorry couldn't resist :P )