Add deprecation banner in legacy docs.

[noissue]

docs/_static/css/custom.css

@@ -0,0 +1,43 @@
+.banner {
+  background: #ffe2c9;
+  height: 50px;
+  border-top: 5px solid #ffad67;
+  width: 100%;
+  position: fixed;
+  z-index: 9999;
+  box-shadow: 0 3px 10px -5px rgb(0 0 0 / 0.2);
+ }
+
+.banner__content {
+  padding: 16px;
+  max-width: 1120px;
+  margin: 0;
+  display: flex;
+  align-items: center;
+  height: 100%;
+ }
+
+.banner__text {
+  flex-grow: 1;
+  line_height: 1.4em;
+  text-align: center;
+  font-weight: bold;
+  font-family: Roboto Slab,ff-tisa-web-pro,Georgia,Arial,sans-serif;
+  color: #505050;
+}
+
+
+@media (min-width: 768px){
+  .wy-side-nav-search {
+    padding-top: 60px;
+  }
+}
+
+@media (max-width: 768px){
+  .wy-nav-top {
+    margin-top: 50px;
+  }
+  .wy-side-nav-search {
+    margin-top: 50px;
+  }
+}

docs/_templates/layout.html

@@ -0,0 +1,22 @@
+{#
+    classic/layout.html
+    ~~~~~~~~~~~~~~~~~~~
+
+    Sphinx layout template for the classic theme.
+
+    :copyright: Copyright 2007-2024 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+#}
+{%- extends "sphinx_rtd_theme/layout.html" %}
+
+{%- block extrabody %}
+    <div class="banner">
+    <div class="banner__content">
+    <div class="banner__text">
+    This docs will be deactivated in July 2024.
+    <a href="https://discourse.pulpproject.org/t/unified-documentation-part-2/1188" target="blank">Learn More</a>
+    or go to the <a href="https://staging-docs.pulpproject.org/" target="blank">New Pulp Docs</a> (beta).
+    </div>
+    </div>
+    </div>
+{%- endblock %}

docs/conf.py

@@ -133,6 +133,7 @@
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
+html_css_files = ['css/custom.css']
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.