Remove Storybook, cleanups (#860)

1. Changed references to point to this new repo
2. Fixed docker image publishing to point to ghcr.io.
3. Remove survey link - the survey is closed and there's no point in
keeping it.
4. Remove storybook - Basically a storybook is the ability to look at
components and see how they look and interact with them.
It's a powerful tool for developing component library with "live"
documentation.
But it's an overkill for this project and I would like to reduce
maintenance costs.
Currently all the "stories" are in javascript and not in typescript and
it feels like a waste of time to try and maintain it, along with
updating the storybook library itself and everything around it.

src/components/Doc.tsx

@@ -31,7 +31,7 @@ export default class Doc extends React.Component<DocProps> {
     const renderValues = (
       !!values &&
       // HACK: Currently we merge additional values into the style spec, so this is required
-      // See <https://github.com/maputnik/editor/blob/main/src/components/PropertyGroup.jsx#L16>
+      // See <https://github.com/maplibre/maputnik/blob/main/src/components/PropertyGroup.jsx#L16>
       !Array.isArray(values)
     );