[IMP] developer: rename addons/js => backend/frontend

The terminology did not really make sense for a lot of these sub pages.
This change should have been done long ago, but was probably delayed
because some people in Odoo call the web client the "backend", which is
really misleading.

This commit also renames the title "Reference Guides" to "Reference",
since this section does not contain any guides anyway.

Part-of: odoo/documentation#1243

content/developer/reference.rst

@@ -1,12 +1,12 @@
 :nosearch:
 :types: reference
 
-================
-Reference Guides
-================
+=========
+Reference
+=========
 
 .. toctree::
     :titlesonly:
 
-    reference/addons
-    reference/javascript
+    reference/backend
+    reference/frontend

content/developer/reference/addons.rst

@@ -1,20 +0,0 @@
-:nosearch:
-
-=============
-Server Addons
-=============
-
-.. toctree::
-    :titlesonly:
-
-    addons/orm
-    addons/data
-    addons/actions
-    addons/views
-    addons/module
-    addons/reports
-    addons/security
-    addons/testing
-    addons/http
-    addons/mixins
-    addons/assets

content/developer/reference/backend.rst

@@ -0,0 +1,20 @@
+:nosearch:
+
+=======
+Backend
+=======
+
+.. toctree::
+    :titlesonly:
+
+    backend/orm
+    backend/data
+    backend/actions
+    backend/views
+    backend/module
+    backend/reports
+    backend/security
+    backend/testing
+    backend/http
+    backend/mixins
+    backend/assets

content/developer/reference/frontend.rst

@@ -0,0 +1,20 @@
+:nosearch:
+
+========
+Frontend
+========
+
+.. toctree::
+    :titlesonly:
+
+    frontend/framework_overview
+    frontend/javascript_modules
+    frontend/owl_component_system
+    frontend/registries
+    frontend/services
+    frontend/generic_components
+    frontend/hooks
+    frontend/javascript_cheatsheet
+    frontend/javascript_reference
+    frontend/mobile
+    frontend/qweb

content/developer/reference/javascript.rst

@@ -1,20 +0,0 @@
-:nosearch:
-
-==========
-Javascript
-==========
-
-.. toctree::
-    :titlesonly:
-
-    javascript/framework_overview
-    javascript/javascript_modules
-    javascript/owl_component_system
-    javascript/registries
-    javascript/services
-    javascript/generic_components
-    javascript/hooks
-    javascript/javascript_cheatsheet
-    javascript/javascript_reference
-    javascript/mobile
-    javascript/qweb

extensions/odoo_theme/layout_templates/homepage.html

@@ -71,17 +71,17 @@
                         </a>
                     </li>
                     <li>
-                        <a href="{{ pathto('developer/reference/addons/orm') }}" class="stretched-link">
+                        <a href="{{ pathto('developer/reference/backend/orm') }}" class="stretched-link">
                             {{ _("ORM") }}
                         </a>
                     </li>
                     <li>
-                        <a href="{{ pathto('developer/reference/addons/views') }}" class="stretched-link">
+                        <a href="{{ pathto('developer/reference/backend/views') }}" class="stretched-link">
                             {{ _("Regular Views") }}
                         </a>
                     </li>
                     <li>
-                        <a href="{{ pathto('developer/reference/javascript/qweb') }}" class="stretched-link">
+                        <a href="{{ pathto('developer/reference/frontend/qweb') }}" class="stretched-link">
                             {{ _("QWeb Views") }}
                         </a>
                     </li>

redirects.txt

@@ -284,4 +284,30 @@ purchase/replenishment/multicompany/setup.rst applications/general/multi_compani
 
 # Redirections introduced in 15.0 :
 
-sales/crm/optimize/outlook_extension.rst productivity/mail_plugins/outlook.rst
+sales/crm/optimize/outlook_extension.rst productivity/mail_plugins/outlook.rst
+
+developer/reference/addons.rst                                   developer/reference/backend.rst
+developer/reference/addons/actions.rst                           developer/reference/backend/actions.rst
+developer/reference/addons/assets.rst                            developer/reference/backend/assets.rst
+developer/reference/addons/data.rst                              developer/reference/backend/data.rst
+developer/reference/addons/http.rst                              developer/reference/backend/http.rst
+developer/reference/addons/mixins.rst                            developer/reference/backend/mixins.rst
+developer/reference/addons/module.rst                            developer/reference/backend/module.rst
+developer/reference/addons/orm.rst                               developer/reference/backend/orm.rst
+developer/reference/addons/reports.rst                           developer/reference/backend/reports.rst
+developer/reference/addons/security.rst                          developer/reference/backend/security.rst
+developer/reference/addons/testing.rst                           developer/reference/backend/testing.rst
+developer/reference/addons/views.rst                             developer/reference/backend/views.rst
+
+developer/reference/javascript.rst                               developer/reference/frontend.rst
+developer/reference/javascript/framework_overview.rst            developer/reference/frontend/framework_overview.rst
+developer/reference/javascript/javascript_modules.rst            developer/reference/frontend/javascript_modules.rst
+developer/reference/javascript/owl_component_system.rst          developer/reference/frontend/owl_component_system.rst
+developer/reference/javascript/registries.rst                    developer/reference/frontend/registries.rst
+developer/reference/javascript/services.rst                      developer/reference/frontend/services.rst
+developer/reference/javascript/generic_components.rst            developer/reference/frontend/generic_components.rst
+developer/reference/javascript/hooks.rst                         developer/reference/frontend/hooks.rst
+developer/reference/javascript/javascript_cheatsheet.rst         developer/reference/frontend/javascript_cheatsheet.rst
+developer/reference/javascript/javascript_reference.rst          developer/reference/frontend/javascript_reference.rst
+developer/reference/javascript/mobile.rst                        developer/reference/frontend/mobile.rst
+developer/reference/javascript/qweb.rst                          developer/reference/frontend/qweb.rst