Settings (#174)

* Reorganize Settings sections and create settings page

* Update the configuration article

* Update configuration page and order

* Update appearance article and screenshots

* Update accepted terms and fix missing image

* Update homepage article and screenshots

* Update scopes article and screenshots

* Fix broken links

* Update help section article and screenshots

* Update allowed external domain article and screenshot, based on PR 156 by
basicavisual

* Fix newsletter screenshot and scope errors

* Fix vale errors

* Add highlighted initiatives homepage block

* Fix vale errors

* Update docs/en/modules/admin/pages/settings/scopes.adoc

Co-authored-by: Carolina Romero <carolromero@users.noreply.github.com>

---------

Co-authored-by: paulinebessoles <pauline.bessoles@opensourcepolitics.eu>
Co-authored-by: Carolina Romero <carolromero@users.noreply.github.com>

.github/styles/config/vocabularies/Decidim/accept.txt

@@ -4,7 +4,9 @@ CSV
 [Dd]ecidim
 [Ee]mail
 [Ff]aq
+[Ff]avicon
 [Gg]amification
+[Kk]akogawa
 Keka
 Mautic
 [Mm]oderations

docs/en/modules/ROOT/nav.adoc

@@ -31,14 +31,15 @@
 *** xref:services:social_providers.adoc[Social Providers]
 
 * xref:admin:index.adoc[Admin]
-** xref:admin:first_steps.adoc[First steps in Decidim]
-** Settings
-*** xref:admin:configuration.adoc[Configuration]
-*** xref:admin:appearance.adoc[Appearance]
-*** xref:admin:homepage.adoc[Homepage]
-*** xref:admin:scopes.adoc[Scopes]
-*** xref:admin:areas.adoc[Areas]
-*** xref:admin:help_sections.adoc[Help sections]
+** xref:admin:first_steps.adoc[First steps]
+** xref:admin:settings.adoc[Settings]
+*** xref:admin:settings/configuration.adoc[Configuration]
+*** xref:admin:settings/appearance.adoc[Appearance]
+*** xref:admin:settings/homepage.adoc[Homepage]
+*** xref:admin:settings/scopes.adoc[Scopes]
+*** xref:admin:settings/areas.adoc[Areas]
+*** xref:admin:settings/help_sections.adoc[Help sections]
+*** xref:admin:settings/allowed_external_domains.adoc[Allowed external domains]
 ** xref:admin:pages.adoc[Pages and Topics]
 *** xref:admin:pages/pages.adoc[Pages]
 *** xref:admin:pages/topics.adoc[Topics]