doc: reST primer -- describe admonitions & customize their CSS

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

docs/_themes/searx/static/searx.css

@@ -28,47 +28,58 @@ p.sidebar-title, .sidebar p {
   list-style-type: disclosure-closed;
 }
 
+/* admonitions
+*/
 
-div.admonition,
+div.admonition, div.topic {
-div.topic {
   background-color: #fafafa;
   margin: 8px 0px;
   padding: 1em;
-  border: none;
+  border-radius: 3pt 0 0 3pt;
+  border-top: none;
+  border-right: none;
+  border-bottom: none;
+  border-left: 5pt solid #ccc;
 }
 
+p.admonition-title:after {
+  content: none;
+}
+
+.admonition.hint      { border-color: #416dc0b0; }
+.admonition.note      { border-color: #6c856cb0; }
+.admonition.tip       { border-color: #85c5c2b0; }
+.admonition.attention { border-color: #ecec97b0; }
+.admonition.caution   { border-color: #a6c677b0; }
+.admonition.danger    { border-color: #d46262b0; }
+.admonition.important { border-color: #dfa3a3b0; }
+.admonition.error     { border-color: red; }
+.admonition.warning   { border-color: darkred; }
+
+.admonition.admonition-generic-admonition-title {
+    border-color: #416dc0b0;
+}
+
+
 /* admonitions with (rendered) reST markup examples (:class: rst-example)
  *
  * .. admonition:: title of the example
  *     :class: rst-example
  *     ....
-/* navigation menu: use sans font and select light/dark colors for better
-* contrast.
 */
 
 div.rst-example {
   padding-left: 12px;
   padding-right: 12px;
-    background-color: white;
+  background-color: inherit;
   transform: scale(0.9);
   transition: transform 1s;
+  border-left: none;
 }
 
-/* div.rst-example > .admonition-title { */
-/*     background-color: inherit; */
-/*     color: inherit; */
-/* } */
-
-/* div.rst-example > .admonition-title:after{ */
-/*     font-family: inherit; */
-/*     font-style: italic; */
-/*     content: "     // hover mouse over .."; */
-/* } */
-
 @media screen {
   div.rst-example:hover {
     transform: scale(1);
-       background-color: inherit;
     padding-left: inherit;
     padding-right: inherit;
     border-left: inherit;

docs/dev/reST.rst

@@ -16,8 +16,6 @@ generated and deployed at :docs:`github.io <.>`.
 The sources of Searx's documentation are located at :origin:`docs`.  Run
 :ref:`make docs-live <make docs-live>` to build HTML while editing.
 
-------
-
 .. sidebar:: Further reading
 
    - Sphinx-Primer_
@@ -36,8 +34,6 @@ The sources of Searx's documentation are located at :origin:`docs`.  Run
    :local:
    :backlinks: entry
 
-------
-
 Sphinx_ and reST_ have their place in the python ecosystem.  Over that reST is
 used in popular projects, e.g the Linux kernel documentation `[kernel doc]`_.
 
@@ -593,6 +589,74 @@ Further list blocks
 - doctest blocks (:duref:`ref <doctest-blocks>`)
 
 
+Admonitions
+===========
+
+Admonitions: :dudir:`hint`, :dudir:`note`, :dudir:`tip` :dudir:`attention`,
+:dudir:`caution`, :dudir:`danger`, :dudir:`error`, , :dudir:`important`, ,
+:dudir:`warning` and the generic :dudir:`admonition <admonitions>`.
+
+.. code:: reST
+
+   .. admonition:: generic admonition title
+
+      lorem ipsum ..
+
+   .. hint::
+
+      lorem ipsum ..
+
+   .. note::
+
+      lorem ipsum ..
+
+   .. warning::
+
+      lorem ipsum ..
+
+
+.. admonition:: generic admonition title
+
+   lorem ipsum ..
+
+.. hint::
+
+   lorem ipsum ..
+
+.. note::
+
+   lorem ipsum ..
+
+.. tip::
+
+   lorem ipsum ..
+
+.. attention::
+
+   lorem ipsum ..
+
+.. caution::
+
+   lorem ipsum ..
+
+.. danger::
+
+   lorem ipsum ..
+
+.. important::
+
+   lorem ipsum ..
+
+.. error::
+
+   lorem ipsum ..
+
+.. warning::
+
+   lorem ipsum ..
+
+
+
 .. _KISS: https://en.wikipedia.org/wiki/KISS_principle
 .. _readability: https://docs.python-guide.org/writing/style/
 .. _Sphinx-Primer: