Mostly updated wiki to Minecraft 1.21.5

[diamond-dev1]

I've checked all pages briefly, so they might not be fully updated. Mainly updated the breaking changes guide.

not sure how conflicts work, but i just changed all pages to have 1.21.5 as supported version, not sure if that is the correct way.

Non-updated pages:
JSON TEXT + others

• Text in /title and such is now specified in SNBT + new stuff/changes

SNBT page

• all the SNBT changes which happened, afaik there are a lot of them

Predicates

• New optional fields have been added to block predicates: components and predicates.
• A new optional field was added to entity predicate: components
• A new optional field has been added to entity predicates: predicates
• The following entity sub-predicates have been removed and replaced with combination of components predicate and variant entity components
• The field color has been removed from minecraft:sheep sub-predicate.
• The stepping_on entity predicate can only evaluate to true if the entity is on ground.

And all pages that aren't marked as compatible with 1.21.5

[GearsDatapacks]

Looks good! A couple of tiny notes

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[GearsDatapacks]

Looks good to me!