Add the depreciation styles (#182)

Author: Revathyvenugopal162

doc/source/getting_started/index.rst

@@ -28,7 +28,7 @@ Consider using the ``conf.py`` for this repository:
 
 .. literalinclude:: ../conf.py
    :language: python
-   
+
 .. toctree::
    :hidden:
    :maxdepth: 2

src/ansys_sphinx_theme/static/css/ansys_sphinx_theme.css

@@ -855,4 +855,14 @@ max-width: 220px;
 margin-left: auto;
 margin-right: auto;
 font-family: var(--pst-font-family-base);
+}
+
+div.deprecated {
+  border-color: var(--pst-color-danger);
+  background-color: #dc354514;
+}
+
+div.versionadded {
+  border-color: var(--pst-color-success);
+  background: #88ca881f;
 }