v3 release checklist

[cwaring]

Master tracking issue for key v3 launch tasks

### Blocker (pre-release)
- [ ] https://github.com/ipfs/ipfs-website/issues/244
- [ ] https://github.com/ipfs/ipfs-website/issues/277
- [ ] https://github.com/ipfs/ipfs-website/issues/274
- [ ] https://github.com/ipfs/ipfs-website/issues/275
- [ ] https://github.com/ipfs/ipfs-website/issues/273

### Optimisations (post-release)
- [x] trigger google search console indexing
- [ ] #226
- [ ] #238
- [ ] https://github.com/ipfs/ipfs-website/issues/202
- [ ] #255
- [ ] Add DMCA footer
- [ ] Apply pagespeed insights
- [ ] (upstream) add images to blog thumbnails