Add oauth support

- Support azure, bitbucket, github, gitlab, google providers
- Add authentication page to settings

Co-authored-by: Suraj Kumar <srjkmr1024@gmail.com>
Co-authored-by: Michael Castanieto <mcastanieto@gmail.com>
Co-authored-by: Mike Kim <m.kim4247@gmail.com>

resources/css/app.css

@@ -175,3 +175,7 @@ input.input-sm {
 option{
     @apply text-white;
 }
+
+.toast {
+    z-index: 1;
+}