add vue client folders, rename server files accordingly and update code

server/api.py

@@ -0,0 +1,17 @@
+"""
+api.py
+
+Provides a accessible protected backend API. JSON I/O only, CSRF protected.
+"""
+import flask_wtf
+from flask import current_app, jsonify
+
+
+@current_app.route('/api/csrf/')
+def csrf():
+    """
+    Page used for refreshing expired CSRF tokens via AJAX.
+
+    Probably secure: https://medium.com/@iaincollins/csrf-tokens-via-ajax-a885c7305d4a
+    """
+    return jsonify(flask_wtf.csrf.generate_csrf())