Documentation correction and update

[isHarryh]

Summary

This PR:

• Fixes some spelling typo.
• Removes the 404 links in the "Important Object Types" (they have been moved to legacy_patch).
• Addes a "Configurations" section where user can have a full understanding of customization.
• Moves "UnityPy Encryption" and "C-Typetree" related content to the "Configuration" section.

[K0lb3]

I will take a look at this PR tomorrow.
I had some important stuff to handle IRL, and afterwards some tasks that accumulated due to it.

From a glance the changes look fine, but as @3ncy already mentioned in his comments, some rephrasing change the meanings of the text, which has to be discussed.

[K0lb3]

Instead of some or another it's probably better to simply name them

custom_compression_function and custom_decompression function,
with a stub above to show their expected functions signature.

[K0lb3]

It might make sense to say can be edited in their native forms and then proceeding to say that some have handled export functions to make the export easier.

[K0lb3]

Sorry for the late response, I kinda forgot about the PR, and well, then Easter came with lots of hiking.

[isHarryh]

Sorry for the late response, I kinda forgot about the PR, and well, then Easter came with lots of hiking.

That's okay. Btw, congratulations to UnityPy for receiving 1k stars!

I have updated the commits according to the suggestions from you and @3ncy . You can view the diffs.