Fix antipattern with IDOM_WEB_MODULE_PATH

[Archmonger]

Old Behavior

Currently, we expect the user to add IDOM_WEB_MODULE_PATH within the urlpattern, however, this is an antipattern within the Django framework

New Behavior

Follow Django conventions and utilize standard path variables.

Implementation Details

Replace instructions to utilize IDOM_WEB_MODULE_PATH with path("idom/", include("django_idom.http.urls"))

Create django_idom.http.urls that contains a urlpatterns = [...]

Anywhere within django-idom where we need to determine the URL, we need to fetch it using django reverse("idom:web_modules")

This implementation also requires that we remove IDOM_BASE_URL as a variable.

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