config: start adding path parameters

to change the urls of the admin page, the my account page and of
invites. Seems to work, but need to check all the code over and test.

config/config-base.yaml

@@ -232,6 +232,33 @@ sections:
     - ["opaque", "Opaque"]
     value: clear
     description: Appearance of the Admin login screen.
+- section: url_paths
+  meta:
+    name: URL Paths
+    description: Settings for changing where different pages are accessed.
+    advanced: true
+  settings:
+  - setting: admin
+    name: Admin page subpath
+    type: text
+    required: true
+    requires_restart: true
+    value: "/"
+    description: URL subpath the admin page should be at.
+  - setting: user_page
+    name: "\"My Account\" subpath"
+    type: text
+    required: true
+    requires_restart: true
+    value: "/my/account"
+    description: URL subpath the "My Account" page should be at.
+  - setting: form
+    name: Invite subpath
+    type: text
+    required: true
+    requires_restart: true
+    value: "/invite"
+    description: URL subpath invites should be on. 
 - section: advanced
   meta:
     name: Advanced