Allow running project without webpack/node

Add a new `render_bundle` template tag which conditionally renders
webpack-loader bundles based on ENABLE_WEBPACK_BUNDLES setting.

When disabled, it makes the React/Webpack loaded parts disapper.

hypha/apply/funds/templates/funds/grouped_application_list.html

 {% extends "base-apply.html" %}
 {% load static %}
-{% load render_bundle from webpack_loader %}
+{% load render_bundle from webpack_tags %}
 
 {% block extra_css %}
 <link rel="stylesheet" href="{% static 'css/apply/fancybox.css' %}">
@@ -36,6 +36,3 @@
     <script src="{% static 'js/apply/batch-actions.js' %}"></script>
     <script src="{% static 'js/apply/flag.js' %}"></script>
 {% endblock %}
-
-
-{% load render_bundle from webpack_loader %}

hypha/apply/funds/templates/funds/submissions.html

 {% extends "funds/base_submissions_table.html" %}
 {% load static %}
-{% load render_bundle from webpack_loader %}
+{% load render_bundle from webpack_tags %}
 
 {% block title %}Submissions{% endblock %}
 {% block content %}

hypha/apply/funds/templates/funds/submissions_by_round.html

 {% extends "funds/base_submissions_table.html" %}
 {% load static %}
-{% load render_bundle from webpack_loader %}
+{% load render_bundle from webpack_tags %}
 
 {% block title %}{{ object }}{% endblock %}
 

hypha/apply/funds/templates/funds/submissions_by_status.html

 {% extends "funds/base_submissions_table.html" %}
-{% load render_bundle from webpack_loader %}
+{% load render_bundle from webpack_tags %}
 
 {% block title %}{{ status }}{% endblock %}
 

hypha/apply/utils/templatetags/webpack_tags.py

+from django import template
+from django.conf import settings
+from webpack_loader.templatetags import webpack_loader
+
+register = template.Library()
+
+
+@register.simple_tag
+def render_bundle(bundle_name, extension=None, config='DEFAULT', attrs=''):
+    """
+    Render webpack bundle if enabled in settings.
+
+    Passes the options to actual `render_bundle` template tag provided by `webpack_loader`.
+    Use this instead of `webpack_loader`.
+    """
+    if settings.ENABLE_WEBPACK_BUNDLES:
+        return webpack_loader.render_bundle(bundle_name, extension, config, attrs)
+    return ''

hypha/settings/base.py

@@ -139,7 +139,6 @@ INSTALLED_APPS = [
     'hijack',
     'compat',
     'pagedown',
-    'webpack_loader',
 
     'salesforce',
 
@@ -659,6 +658,9 @@ if env.get('COOKIE_SECURE', 'false').lower().strip() == 'true':
 REFERRER_POLICY = env.get('SECURE_REFERRER_POLICY',
                           'no-referrer-when-downgrade').strip()
 
+# Webpack bundle loader
+# When disabled, all included bundles are silently ignored.
+ENABLE_WEBPACK_BUNDLES = True
 WEBPACK_LOADER = {
     'DEFAULT': {
         'BUNDLE_DIR_NAME': 'app/',