[Feature] Modern UI roll out (#236)

This PR moves all the collection pages into the new UI in a rough push.
I did not put the same amount of care into these as into search, index, and predict.

## Major changes

- All modals are now migrated to a state based alpine.js implementation.
- jQuery is no longer present in the base layout; ajax is replace by native fetch api
- most of the pps.js is now obsolte (as I understand it; the code is not referenced any more @jebus  please double check)
- in-memory pagination for large result lists (set to 50; we can make that configurable later; performance degrades at around 1k) stukk a bit rough tracked in #235

## Minor things

- Sarch and index also use alpine now
- The loading spinner is now CSS animated (not sure if it currently gets correctly called)

## Not done

- Ihave not even cheked the admin pages. Not sure If these need migrations
- The temporary migration pages still use the old template. Not sure what is supposed to happen with those? @jebus

## What I did to test

- opend all pages in browse, and user ; plus all pages reachable from there.
- Interacted and tested the functionality of each modal superfically with exception of the API key modal (no functional test).

---
This PR is massive sorry for that; just did not want to push half-brokenn state.
@jebus @liambrydon I would be glad if you could click around and try to break it :)

Finally closes #133

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#236
Co-authored-by: Tobias O <tobias.olenyi@envipath.com>
Co-committed-by: Tobias O <tobias.olenyi@envipath.com>

epdb/views.py

@@ -62,6 +62,26 @@ def log_post_params(request):
             logger.debug(f"{k}\t{v}")
 
 
+def get_error_handler_context(request, for_user=None) -> Dict[str, Any]:
+    current_user = _anonymous_or_real(request)
+
+    if for_user:
+        current_user = for_user
+
+    ctx = {
+        "title": "enviPath",
+        "meta": {
+            "site_id": s.MATOMO_SITE_ID,
+            "version": "0.0.1",
+            "server_url": s.SERVER_URL,
+            "user": current_user,
+            "enabled_features": s.FLAGS,
+            "debug": s.DEBUG,
+        },
+    }
+    return ctx
+
+
 def error(request, message: str, detail: str, code: int = 400):
     context = get_base_context(request)
     error_context = {
@@ -76,6 +96,48 @@ def error(request, message: str, detail: str, code: int = 400):
     return render(request, "errors/error.html", context, status=code)
 
 
+def handler400(request, exception):
+    """Custom 400 Bad Request error handler"""
+    context = get_error_handler_context(request)
+    context["public_mode"] = True
+    return render(request, "errors/400_bad_request.html", context, status=400)
+
+
+def handler403(request, exception):
+    """Custom 403 Forbidden error handler"""
+    context = get_error_handler_context(request)
+    context["public_mode"] = True
+    return render(request, "errors/403_access_denied.html", context, status=403)
+
+
+def handler404(request, exception):
+    """Custom 404 Not Found error handler"""
+    context = get_error_handler_context(request)
+    context["public_mode"] = True
+    return render(request, "errors/404_not_found.html", context, status=404)
+
+
+def handler500(request):
+    """Custom 500 Internal Server Error handler"""
+    context = get_error_handler_context(request)
+
+    error_context = {}
+    error_context["error_message"] = "Internal Server Error"
+    error_context["error_detail"] = "An unexpected error occurred. Please try again later."
+
+    if request.headers.get("Accept") == "application/json":
+        return JsonResponse(error_context, status=500)
+
+    context["public_mode"] = True
+    context["error_code"] = 500
+    context["error_description"] = (
+        "We encountered an unexpected error while processing your request. Our team has been notified and is working to resolve the issue."
+    )
+    context.update(**error_context)
+
+    return render(request, "errors/error.html", context, status=500)
+
+
 def login(request):
     context = get_base_context(request)
 
@@ -192,8 +254,8 @@ def register(request):
 
 
 def editable(request, user):
-    if user.is_superuser:
-        return True
+    # if user.is_superuser:
+    #     return True
 
     url = request.build_absolute_uri(request.path)
     if PackageManager.is_package_url(url):