mention QuEra computing in banner

Author: Roger-luo

docs/stylesheets/extra.css

@@ -1,8 +1,22 @@
 :root {
-    --md-primary-fg-color:        #FF5722;
-    --md-primary-fg-color--light: #FF784E;
-    --md-primary-fg-color--dark:  #B23C17;
+  --md-primary-fg-color: #6437FF;
+  --md-accent-fg-color: #6437FF;
+}
 
-    --md-primary-fg-color: #FF784E;
-    --md-accent-fg-color:  #FF784E;
-  }
+#logo_light_mode {
+  display: var(--md-footer-logo-light-mode);
+}
+
+#logo_dark_mode {
+  display: var(--md-footer-logo-dark-mode);
+}
+
+[data-md-color-scheme="slate"] {
+  --md-footer-logo-dark-mode:         block;
+  --md-footer-logo-light-mode:         none;
+}
+
+[data-md-color-scheme="default"] {
+  --md-footer-logo-dark-mode:           none;
+  --md-footer-logo-light-mode:         block;
+}

mkdocs.yml

@@ -72,6 +72,7 @@ nav:
           - IdTable: reference/kirin/idtable.md
           - Source: reference/kirin/source.md
           - WorkList: reference/kirin/worklist.md
+  - About QuEra Computing: 'https://quera.com'
 
 theme:
   name: material