Draft: Restore files from Discord CDN

Changelog

The format is based on Keep a Changelog.

Fixed

• Replace links to files hosted on the Discord CDN to their analogous on Wasabi S3.

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Note:

Upload files attached in Media files missing (#33 - closed) before merging this MR.

Note:

The links in this MR point to https://s3.eu-central-2.wasabisys.com/veloren-book/cdn/(...). Please, keep in mind that the URL contains veloren-book rather than veloren-blog, as previously used in other MRs, so you might need to create this directory structure in Wasabi S3 first.

Closes #33 (closed).