ci: Don't fetch blobs on deploy

ci: Replace actions-gh-pages

Try http2 with multiplexing

Try httpx

Revert to fa737abbf604ff026fb9e68be9819242ae32bef3

Test

Revert to 89f4334f302b8486d3b9caff11e7d70a53004b93

Reduce concurrency

Reduce max-connection-per-server to 2

Improve exponential backoff

Reduce max-connection-per-server

Retry for 429 errors

Fix aria2p

Refactor

Use aria2p