Kindling: Query Pagination prev/next block customizations carried over are very buggy

[sync-by-unito]

This feature was used on MFH (iirc) and it worked but it's not really fully fleshed out. The styling and the child page nav block variation are buggy especially for a fresh new site. Those features were very specific to MFH and should be taken out of the repo.

The child page nav blocks are nice to have but they kill the text no matter the setting. The idea was to kill the "Previous" and "Next" text to replace it with a custom arrow icon but it also killed the text when that setting is set to "none" instead of "arrow" or "chevron".

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