Re-evaluate `0x` tool tier-list

[RafaelGSS]

As discussed in #533. I'm adding this item to the agenda to evaluate its tier or remove it from the tier-list document.

[github-actions]

This issue is stale because it has been open many days with no activity. It will be closed soon unless the stale label is removed or a comment is made.

[tony-go]

Move it to tier 4!