Move content of caution admonition to announcement banner

* Move content of caution admonition block to announcement banner, as
  this results in a cleaner main page

* Remove ``html_sidebars`` for testing purposes

docs/conf.py

@@ -210,6 +210,7 @@ def setup(app):
     "header_links_before_dropdown": 6,
     "navbar_start": ["navbar-logo"],
     "use_edit_page_button": True,
+    "icon_links_label": "Quick Links",
     "icon_links": [
         {
             "name": "CTA Observatory",
@@ -218,11 +219,13 @@ def setup(app):
             "icon": "https://www.cta-observatory.org/wp-content/themes/ctao/favicon.ico",
         },
     ],
+    "announcement": """
+        <p>ctapipe is not stable yet, so expect large and rapid
+        changes to structure and functionality as we explore various
+        design choices before the 1.0 release.</p>
+    """,
 }
 
-html_sidebars = {"**": ["sidebar-nav-bs.html", "sidebar-ethical-ads.html"]}
-
-
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".

docs/index.rst

@@ -40,12 +40,6 @@ Prototype CTA Pipeline Framework (``ctapipe``)
 
 ``ctapipe`` is a framework for prototyping the low-level data processing algorithms for the Cherenkov Telescope Array.
 
-.. CAUTION::
-   This is not yet stable code, so expect large and rapid changes to
-   structure and functionality as we explore various design choices before
-   the 1.0 release.
-
-
 .. _ctapipe_docs:
 
 .. toctree::