CKEditor 5 wysiwyg profile changes

[keelanfh]

Since this is config, my understanding is that this should not affect existing installs.

We could be concerned about affecting existing installs but I think this is more logical for new ones.

[keelanfh]

Closes #184

[keelanfh]

I've updated this PR with a couple of other changes. This now includes, all for new installs only:

• Changing class applied to Alert failure to alert-fail rather than alert-primary
• To fix one of the things mentioned in Drupal 10 and CKEditor 5 issues/differences #181, I've removed the "code" and "code block" styles. We didn't have these styles in CKEditor 4, and I personally think they clutter up the editor.
• I've re-added the default linkit profile here, which went missing in the move to CKEditor 5.
• Removing bootstrap classes as mentioned in Do we still need bootstrap classes? localgov#582

[kiwimind]

Based on the comment #185 (comment), this all looks good.
I realise @finnlewis questioned the linkit addition, however if this is replacing functionality that went missing, that feels like another conversation.