WIP: web basic auth

[rkspx]

Displays authentication form if initial authentication using esconfig.json fails, values submitted by the authentication form will be used as elasticsearch credential

[codecov[bot]]

Codecov Report

Merging #340 (609b06b) into master (62c5057) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #340   +/-   ##
=======================================
  Coverage   73.43%   73.43%           
=======================================
  Files          55       55           
  Lines        4326     4326           
=======================================
  Hits         3177     3177           
  Misses       1111     1111           
  Partials       38       38           

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