migrate from flask to quart.

also remove all flaskiness from static file serving.
and reference all vendored scripts on the base tempĺate for simplicity.

lnbits/extensions/lnticket/views.py

@@ -1,4 +1,4 @@
-from flask import g, abort, render_template
+from quart import g, abort, render_template
 
 from lnbits.decorators import check_user_exists, validate_uuids
 from http import HTTPStatus
@@ -10,16 +10,16 @@ from .crud import get_form
 @lnticket_ext.route("/")
 @validate_uuids(["usr"], required=True)
 @check_user_exists()
-def index():
-    return render_template("lnticket/index.html", user=g.user)
+async def index():
+    return await render_template("lnticket/index.html", user=g.user)
 
 
 @lnticket_ext.route("/<form_id>")
-def display(form_id):
+async def display(form_id):
     form = get_form(form_id) or abort(HTTPStatus.NOT_FOUND, "LNTicket does not exist.")
     print(form.id)
 
-    return render_template(
+    return await render_template(
         "lnticket/display.html",
         form_id=form.id,
         form_name=form.name,