Add unbind for github and discord

[vtm9]

Add unbind buttons for discord/github auths

[codecov-io]

Codecov Report

Merging #955 (d3b2555) into master (d92d1e1) will decrease coverage by 0.25%.
The diff coverage is 55.55%.

@@            Coverage Diff             @@
##           master     #955      +/-   ##
==========================================
- Coverage   74.15%   73.90%   -0.26%     
==========================================
  Files         103      103              
  Lines        1869     1893      +24     
==========================================
+ Hits         1386     1399      +13     
- Misses        483      494      +11     

Impacted Files	Coverage Δ
services/app/lib/codebattle/user.ex	100.00% <ø> (ø)
services/app/lib/codebattle/oauth/github_user.ex	77.14% <12.50%> (-19.16%)	⬇️
...codebattle_web/controllers/auth_bind_controller.ex	50.00% <50.00%> (ø)
services/app/lib/codebattle/oauth/user.ex	25.00% <75.00%> (+13.88%)	⬆️
services/app/lib/codebattle/oauth/discord_user.ex	97.14% <100.00%> (+0.08%)	⬆️
...ttle_web/controllers/api/v1/settings_controller.ex	100.00% <100.00%> (ø)
.../lib/codebattle_web/controllers/auth_controller.ex	34.78% <100.00%> (ø)
...es/app/lib/codebattle_web/channels/game_channel.ex	80.30% <0.00%> (-6.07%)	⬇️
services/app/lib/codebattle/bot/player_server.ex	65.21% <0.00%> (+1.44%)	⬆️
...es/app/lib/codebattle_web/channels/chat_channel.ex	100.00% <0.00%> (+3.33%)	⬆️
... and 1 more

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