[doc] add global TOC to sidebar

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

docs/_themes/searxng/static/searxng.css

@@ -20,6 +20,10 @@ div.sidebar {
   border-radius: 3pt;
 }
 
+div.sphinxsidebar p.caption {
+  display: none;
+}
+
 p.sidebar-title, .sidebar p {
   margin: 6pt;
 }

docs/conf.py

@@ -157,7 +157,13 @@ if CONTACT_URL:
     html_context["project_links"].append(ProjectLink("Contact", CONTACT_URL))
 
 html_sidebars = {
-    "**": ["project.html", "relations.html", "searchbox.html", "sourcelink.html"],
+    "**": [
+        "globaltoc.html",
+        "project.html",
+        "relations.html",
+        "searchbox.html",
+        "sourcelink.html"
+    ],
 }
 singlehtml_sidebars = {"index": ["project.html", "localtoc.html"]}
 html_logo = "../src/brand/searxng-wordmark.svg"