chore: import upstream snapshot with attribution

scripts/docs/_static/custom.css

@@ -0,0 +1,93 @@
+.title {
+    font-weight:700;
+}
+
+.sd-card-header {
+    font-weight:700;
+    font-size: 16px;
+}
+
+
+.bd-page-width {
+    max-width: 100rem;
+}
+
+.bd-sidebar-primary {
+    flex: 0 0 20%;
+}
+
+.bd-main .bd-content .bd-article-container {
+    max-width: 70em;
+}
+
+/* Background color for feature announcement */
+html[data-theme="light"] {
+    --header-announcement-color: #3278e5;
+}
+
+html[data-theme="dark"] {
+    --header-announcement-color: #67d6ed;
+}
+
+.bd-header-announcement {
+    background: var(--header-announcement-color);
+}
+/* Background color for feature announcement */
+
+/* Background color for warning announcement */
+/*html[data-theme="light"] {*/
+/*    --header-announcement-color: #fff070;*/
+/*}*/
+
+/*html[data-theme="dark"] {*/
+/*    --header-announcement-color: #4d4d00;*/
+/*}*/
+
+/*.bd-header-announcement {*/
+/*    background: var(--header-announcement-color);*/
+/*}*/
+/* Background color for warning announcement */
+
+/* (A) LIGHTBOX BACKGROUND */
+#lightbox {
+    /* (A1) COVERS FULLSCREEN */
+    position: fixed; z-index: 1060;
+    top: 0; left: 0;
+    width: 100%; height: 100%;
+
+    /* (A2) BACKGROUND */
+    background: rgba(0, 0, 0, 0.5);
+
+    /* (A3) CENTER IMAGE ON SCREEN */
+    display: flex;
+    align-items: center;
+    align-items: center;
+
+    /* (A4) HIDDEN BY DEFAULT */
+    visibility: hidden;
+    opacity: 0;
+
+    /* (A5) SHOW/HIDE ANIMATION */
+    transition: opacity ease 0.4s;
+}
+/* (A6) TOGGLE VISIBILITY */
+#lightbox.show {
+    visibility: visible;
+    opacity: 1;
+}
+/* (B) LIGHTBOX IMAGE */
+#lightbox img {
+    /* (B1) DIMENSIONS */
+    width: 100%;
+    height: 100%;
+
+    /* (B2) IMAGE FIT */
+    /* contain | cover | fill | scale-down */
+    object-fit: contain;
+}
+
+.avatar {
+  border-radius: 50%;
+  width: 30px;
+  height: 30px;
+}