override or create built-in & inherited admonition directives

This replaces the details-patch.py and the md-admonition.py modules by using the newer custom admonitions feature to override built-in admonition directives and create new directives that use inherited admonition styling from upstream.

Adds a new `:title:` option to built-in and generated admonitions. Also allows an optional argument to generated directives for custom titles.
update all docs

The removal of details_patch.py and md_admonition.py modules means we should now use the new generated directives' options. This affects all docs because upstream has deprecated some admonition aliases that we were using in various places.

Switch to documenting the overridden generic admonition directive to demonstrate the various uses provided by the overwritten built-in admonition directives & the newly created admonition directives.

rename exemplified animated admonition's CSS class name for less confusion.

docs/_static/extra_css.css

@@ -11,6 +11,23 @@
   transform: none;
 }
 
+/* ************************* annimated-admonition-border style ******************************** */
+@keyframes flash_border {
+  0% {
+    border-color: blueviolet;
+  }
+  50% {
+    border-color: aqua;
+  }
+  100% {
+    border-color: blueviolet;
+  }
+}
+
+.md-typeset .admonition.annimated-admonition-border {
+  animation: flash_border 1.5s infinite;
+}
+
 /* ************************* my-special-key style ************************************* */
 
 .md-typeset kbd.key-my-special-key,
@@ -21,9 +38,9 @@
 
 .md-typeset kbd.key-git::before {
   content: "██";
-  -webkit-mask-image: var(--md-icon__fa-git);
+  -webkit-mask-image: var(--si-icon--fontawesome_brands_git);
   -webkit-mask-repeat: no-repeat;
-  mask-image: var(--md-icon__fa-git);
+  mask-image: var(--si-icon--fontawesome_brands_git);
   mask-repeat: no-repeat;
 }