Fix 404 error

[amirhhashemi]

This PR fixes two 404 errors that happened for different reasons.

#1524: The <ImageLinks> component was not defined properly. I think it was created during the transaction to the osmium theme. I'm not familiar with that theme and not sure if that's a bug on their side. The most reasonable fix was to move it to the osmium/src/ui/image-link.tsx file and export it from the mdx-components.ts file.
#1546 and #1472: We don't have a warning callout. Changed it to caution.

Closes #1546
Closes #1524
Closes #1472

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[LadyBluenotes]

The page "deploying your own app" is broken because it imports the following:

import { ImageLink } from "~/components/ImageLink";