Update README.md

[FooqX]

1. removed the text where it says that nimlangserver requires nimsuggest, since it's now built in to Nim core and you do not have to know this information.
2. made text more consistent by adding the missing bullet points in the part where it says how to install nim extension for different text editors
3. improved the text about neovim setup
4. moved the emacs setup guide to where all the other text editor setup guides are (what is emacs even doing down there instead of being at the top with all the other text editors) aswell as removed the redundant vscode setup duplicate near where emacs was.
5. removed 'You can install nimlangserver using the instructions for your text editor below', because it was useless there as there weren't any instructions below. You can re-add this where the actual instructions are if you want.
6. removed the "Extension" (it was even mispelled there) word from the Zed editor setup guide, because it's redundant there, as "extension" is already mentioned, and in Zed extensions, it is called just "Nim".