Add banner explaining static openscad images

docs/docs/general-cadhub/openscad-previews.mdx

@@ -0,0 +1,9 @@
+---
+title: OpenSCAD Previews
+---
+
+you may have noticed that the 3d viewer for OpenSCAD is not fully live. changing perspective of the camera takes a moment before the model updates.
+
+The reason for this is that what's shown is not a 3d asset but instead an image generated by OpenSCAD from the same perspective as the in browser camera.
+This is done to show a preview as quickly as possible as it can take OpenSCAD much longer to product full 3d file (often minutes) than it does to create a preview image (a few seconds).
+

docs/package.json

@@ -14,9 +14,9 @@
     "write-heading-ids": "docusaurus write-heading-ids"
   },
   "dependencies": {
-    "@docusaurus/core": "2.0.0-beta.0",
-    "@docusaurus/plugin-ideal-image": "2.0.0-beta.0",
-    "@docusaurus/preset-classic": "2.0.0-beta.0",
+    "@docusaurus/core": "^2.0.0-beta.6",
+    "@docusaurus/plugin-ideal-image": "^2.0.0-beta.6",
+    "@docusaurus/preset-classic": "^2.0.0-beta.6",
     "@mdx-js/react": "^1.6.21",
     "@tailwindcss/aspect-ratio": "0.2.1",
     "autoprefixer": "^10.2.5",

docs/sidebars.js

@@ -27,6 +27,7 @@ module.exports = {
         'round-anything/radii-conflict',
       ],
     },
-    'general-cadhub/external-resource-url'
+    'general-cadhub/external-resource-url',
+    'general-cadhub/openscad-previews'
   ],
 }

docs/src/css/custom.css

@@ -16,6 +16,16 @@
   font-size: 56px;
 } */
 
+.footer__items .footer__item a span {
+  display: flex;
+  align-items: center;
+}
+
+.navbar__items--right a span {
+  display: flex;
+  align-items: center;
+}
+
 @layer base {
   h1 {
     @apply text-4xl font-bold