re-add old guides to the new docs

[ghostdevv]

We need to re-add the guides from v1 docs to the v2 docs. The following guides need to be added:

• [ ] Background Removal
• [ ] Image Optimization
• [ ] Image Overlays
• [ ] Image Underlays
• [ ] Placeholders
• [ ] Responsive Images
• [ ] Social Media Cards
• [ ] Text Overlays
• [ ] Uploading Images And Videos

We're using Starlight for docs currently, so you can add the files at packages/docs/src/content/guides. The file names should be the same (except .mdx instead of .md). The content may need tweaking to be up-to-date with the new synatx but I'll make sure it's all good during review. It's mostly about moving the content over. If you need to add tabs for multi-codeblocks, you can use the tabs component from starlight. You'll also need to remove the redirect entry for your guides from the vercel.json