Add support for long form quest URLs (#17)

This adds the ability to configure long form quest definitions for a
workspace through a URL rather than entering the JSON directly. For the
frontend piece, we add a quest definition "type" switcher and a new
field for the URL.

The associated backend piece:
TaskarCenterAtUW/workspaces-tasking-manager#8

<img width="874" height="425" alt="image"
src="https://github.com/user-attachments/assets/fac337f9-023a-4763-84f5-5a478818d867"
/>

Author: jeffmaki

Dockerfile

@@ -6,6 +6,10 @@ ARG VITE_API_URL
 ARG VITE_OSM_URL
 ARG VITE_RAPID_URL
 ARG VITE_PATHWAYS_EDITOR_URL
+ARG VITE_IMAGERY_SCHEMA
+ARG VITE_IMAGERY_EXAMPLE_URL
+ARG VITE_LONG_FORM_QUEST_SCHEMA
+ARG VITE_LONG_FORM_QUEST_EXAMPLE_URL
 ARG CODE_VERSION=unknown
 
 WORKDIR /app/
@@ -24,4 +28,4 @@ RUN echo "This is (frontend, cgimap, osmrails, pathways, rapid, taskingmanager)
 
 RUN chown -R nginx:nginx /usr/share/nginx/html/
 
-COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY nginx.conf /etc/nginx/conf.d/default.conf