Custom error page for 401 Unauthorized that redirect to login screen

[kwypchlo]

• replaces current 401 blank page that had message "" with a proper error page that redirects user after 5 seconds to account login page (redirects back to original url after authentication)
• this pull request does not replace 403 error page where user is authenticated but doesn't have active subscription (will come in separate pull request)

[linear[bot]]

SKY-30 Redirect auth error to login page

* [ ] Instead of showing users an error page that access requires authentication, redirect them to a login page * [ ] After being logged in, the login page should redirect them back to the page they were trying to access.

[codecov[bot]]

Codecov Report

Merging #12 (a2fac04) into main (43b7d9b) will increase coverage by 2.53%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
+ Coverage   91.31%   93.84%   +2.53%     
==========================================
  Files          15       16       +1     
  Lines         806      813       +7     
==========================================
+ Hits          736      763      +27     
+ Misses         70       50      -20     

Impacted Files	Coverage Δ
nginx/libs/skynet/account.lua	27.27% <100.00%> (+27.27%)	:arrow_up:
nginx/libs/skynet/account.spec.lua	100.00% <100.00%> (ø)

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