Update color scheme, branding, and streamline custom CSS (#133)

* update footer text

* remove custom.css file leftover from JB era

* tidy up custom css and add new color scheme info

* formatting

_static/style.css

@@ -6,27 +6,26 @@
     min-width: 50px;
     top: 50%;
     transform: translateY(-50%);
-
 }
 
 /* override the default background image behavior */
 .sd-card-img {
     height: auto;
 }
 
-/* override toc css */
-/* controls dropdown icon color */
-.bd-toc-item.active {
-    margin-bottom: 1rem;
-    color: #012169;
+/* mathjax */
+div.math, span.math {
+    align-items: baseline;
 }
 
-/* controls sidebar header color */
-.caption-text {
-    color: #012169;
+html[data-theme="light"] {
+    --pst-color-primary: #1A658F;
+    --pst-color-secondary: #012169;
+    --pst-color-table-row-hover-bg: #C3D7EE;
 }
 
-/* mathjax */
-div.math, span.math {
-    align-items: baseline;
+html[data-theme="dark"] {
+    --pst-color-primary: #5A98C5;
+    --pst-color-secondary: #A8C700;
+    --pst-color-table-row-hover-bg: #53565A;
 }

conf.py

@@ -240,7 +240,7 @@
     use_repository_button=True,
     use_issues_button=True,
     home_page_in_toc=False,
-    extra_footer="<em>The National Center for Atmospheric Research is sponsored by the National Science Foundation. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation.</em>",
+    extra_footer="<em>This material is based upon work supported by the NSF National Center for Atmospheric Research, a major facility sponsored by the U.S. National Science Foundation and managed by the University Corporation for Atmospheric Research. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the U.S. National Science Foundation.</em>",
 )
 
 # Add analytics
@@ -387,9 +387,3 @@
 
 # generate warning for all invalid links
 # nitpicky = True
-
-
-# Allow for changes to be made to the css in the theme_overrides file
-def setup(app):
-    app.add_css_file('theme_overrides.css')
-    # app.connect("builder-inited", update_gallery)