Explain blocks and blockstates in more depth

[IchHabeHunger54]

This PR improves and expands on the explanation of blocks and blockstates. More specifically, it:

• Adds more information on how every block and every blockstates exists in memory once, and why calling new Block() is a bad idea
• Adds more information on when to use blocks, when to use blockstates, and when to use block entities
• Adds a brief explanation of blockstate JSONs and block model JSONs, with references to the Resources section
• Adds information about how most methods expect a BlockState rather than a Block, and why that is the case
• Adds more information about BlockState's most important usecases, specifically BlockState#getProperty, BlockState#setProperty, Level#getBlockState and Level#setBlock
• Adds information on the update flags for Level#setBlock
• Removes the historical section about block metadata, as it is irrelevant to the average modder
• Removes the disclaimer about optional registration, as that is better suited for the registration section
• Rewords some sections and fixes some grammar and spelling issues

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[IchHabeHunger54]

I was under the impression that we held to the old project's standard of not including example code in the docs. As I understand it, this has changed, so I will update the PR accordingly.

[ChampionAsh5357]

Yeah, generally prefer pseudocode like java with comments over exact examples unless necessary. The guidelines should show an example

[IchHabeHunger54]

Rewrote major parts of it to consider the feedback, examples have been added. I also added a WIP method reference page that I will finish tomorrow (hopefully). Converting to draft for now.

[IchHabeHunger54]

I also dismissed most of the feedback since I fixed most of it when rewriting ("fixed" from my point of view). If there are problems with it still, feel free to re-add feedback as needed.

[embeddedt]

I am not sure what's happening (could be a bug on my end), but it seems like many of the issues raised in the review comments are still present in the diff view on GitHub, despite the comment being marked as resolved.

[IchHabeHunger54]

Yes, I forgot to push.

[IchHabeHunger54]

I decided to use EndPortalFrameBlock as an example rather than AbstractFurnaceBlock, as it doesn't have any block entity things going on that might lead to confusion when new modders decide to look there for an example.