Parts of the release process are outdated or don't make sense.
Changes include:
- Revision of "Check configuration" section, as it does not check anything configuration related.
- Moved the "Verify tests passed" section to after the "Update documents / code..." since tests should always be run on the release candidate.
- Moved items in the wrong sections to places that make more sense.
- Removed references to disk size expectations, as these were duplicated, outdated, and are now handled by automation.
- Reworded notes on updating chainparams and seeds.
- Simplified pushing to Github since the commits are automated.
- Removed the note about updating the version number on bitcoinabc.org since /latest effectively does this for us.