Fix deprecation warning box in docs (#831)

Author: hwikle-lanl

docs/_static/custom.css

@@ -0,0 +1,8 @@
+.admonition.warning {
+    background-color: #fff8dc; /* Match warning background */
+    border: 1px solid #f0ad4e;
+}
+
+.admonition.warning > .admonition-title {
+    color: #8a6d3b;
+}

docs/conf.py

@@ -170,5 +170,5 @@
      'Miscellaneous'),
 ]
 
-
-
+def setup(app):
+    app.add_css_file("custom.css")

docs/tests/index.rst

@@ -3,9 +3,9 @@
    :caption: Tests Contents:
 
    format.rst
+   suites.rst
    run.rst
    build.rst
-   suites.rst
    env.rst
    permutations.rst
    values.rst

docs/tests/suites.rst

@@ -41,7 +41,9 @@ the previous section. Note the difference in file name between the two organizat
 first, the name of the file is the name of the suite; in the second, the file name is the generic
 `suite.yaml`, and Pavilion derives the suite name from its containing directory.
 
-.. warning:: Deprecation Warning
+.. admonition:: Deprecation Warning
+    :class: warning
+
     Pavilion 2.4 uses the `tests` and `test_src` subdirectories to store suite configs and test
     source code respectively. As of the latest release, these directories are deprecated in favor
     of the single `suites` directory, and support for them will eventually be removed.