Add documentation for the FEniCSx adapter

.gitmodules

@@ -33,3 +33,7 @@
 [submodule "imported/preeco-orga"]
 	path = imported/preeco-orga
 	url = https://github.com/precice/preeco-orga
+[submodule "imported/fenicsx-adapter"]
+	path = imported/fenicsx-adapter
+	url = https://github.com/precice/fenicsx-adapter
+	branch = develop

_config.yml

@@ -212,6 +212,18 @@ defaults:
       topnav: topnav
       toc: true
       github_editme_path: https://github.com/precice/dumux-adapter/edit/develop/ # ends in /
+  -
+    scope:
+      path: "imported/fenicsx-adapter/"
+      type: "pages"
+    values:
+      layout: "page"
+      comments: false
+      search: true
+      sidebar: docs_sidebar
+      topnav: topnav
+      toc: true
+      github_editme_path: https://github.com/precice/fenicsx-adapter/edit/develop/ # ends in /
   -
     scope:
       path: "imported/preeco-orga/"
@@ -308,6 +320,7 @@ subprojects:
   - imported/su2-adapter/docs
   - imported/dune-adapter/docs
   - imported/dumux-adapter/docs
+  - imported/fenicsx-adapter/docs
   - imported/preeco-orga/guidelines
 
 # We use these versions to centrally update links
@@ -329,4 +342,4 @@ matrix_url: "https://matrix.to/#/#precice_lobby:gitter.im?web-instance[element.i
 precice_v1_citations: 432
 precice_v1_citations_url: https://scholar.google.com/scholar?cites=5053469347483527186&as_sdt=2005&sciodt=0,5&hl=en
 precice_v2_citations: 187
-precice_v2_citations_url: https://scholar.google.com/scholar?oi=bibs&hl=en&cites=17974677460269868025,12004404035922881061
+precice_v2_citations_url: https://scholar.google.com/scholar?oi=bibs&hl=en&cites=17974677460269868025,12004404035922881061

_data/sidebars/docs_sidebar.yml

@@ -414,6 +414,14 @@ entries:
           url: /adapter-fenics.html
           output: web, pdf
 
+      - title: FEniCSx
+        output: web, pdf
+        subfolderitems:
+
+        - title: Overview
+          url: /adapter-fenicsx.html
+          output: web, pdf
+
       - title: G+Smo
         output: web, pdf
         subfolderitems: