auth: groups and memberships (#97)

* group membership unpolished

* fixed index.html

* fixed undefined variable errors

* Implemented adding a user to a group.

* fixed variable names, moved permission check into handler, separated fanctionality for adding ownership or membership for user

* minor changes: Gave variables consistent names

* separated tables for owners and members. some clean code fixes. added group description into group page.

* added to creat child group. minor fixes

* added yaml files

* added cue file

* moved groupOwnership check separatly. redo conditionals into oneline. separated status string check.

* added mempership into app.go infraAppConfigs

* changed svg icon. fixed indentation

* svg icon fix

* added  transaction

* minor owner add fix

* added multiple db rollbacks

---------

Co-authored-by: Giorgi Lekveishvili <lekva@gl-mbp-m1-max.local>
diff --git a/core/auth/memberships/static/main.css b/core/auth/memberships/static/main.css
new file mode 100644
index 0000000..7d4e759
--- /dev/null
+++ b/core/auth/memberships/static/main.css
@@ -0,0 +1,13 @@
+.headline {
+    margin-bottom: 6px;
+}
+
+.description {
+    margin-left: 1px;
+    margin-bottom: 6px;
+}
+
+.divider {
+    margin-top: 10px;
+    margin-bottom: 10px;
+}