Feature: Introduce Super Admins (#705)

* Feature: Introduce Super Admins

- added new devise model for super user
- added administrate gem
- sample dashboards for users and accounts

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

app/javascript/dashboard/assets/scss/super_admin/index.scss

@@ -0,0 +1,5 @@
+@import '../variables';
+
+.superadmin-body {
+  background: $color-background;
+}

app/javascript/dashboard/assets/scss/super_admin/pages.scss

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+@import 'shared/assets/fonts/inter';
+@import '../variables';
+
+body {
+  background-color: $color-background;
+  font-family: Inter;
+}
+
+.button {
+  background-color: $color-woot;
+  border-radius: 1px solid $color-woot;
+  color: $color-white;
+}

app/javascript/packs/superadmin.js

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+import '../dashboard/assets/scss/app.scss';
+import '../dashboard/assets/scss/super_admin/index.scss';

app/javascript/packs/superadmin_pages.js

@@ -0,0 +1 @@
+import '../dashboard/assets/scss/super_admin/pages.scss';