docs: excessive-entities page

[Solant]

Background

This is a reimagining of the previous MR #859 with previously discussed changes

Some questions before the review:

• I was trying to add a reasoning section about "How excessive entities can harm the project," but it appeared to be harder than I thought (without a good diff view and fs structure widget). Do you think it is needed regardless?
• I'm not 100% satisfied with the code examples I gave, because the majority of them are a bit stretched examples of thin clients. It would be great to have some kind of shared project example with appropriate usage of entities that doesn't require a significant amount of time to be understood. Maybe you have some kind of example?

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[Solant]

Hey @illright, thanks for the feedback. I tried to accommodate all the points you mentioned; please let me know if everything is ok