Include custom package in vim docs (#92811)

Describe how to package a plugin that doesn't exist in nixpkgs (and also how to include an external file).

Co-authored-by: Jörg Thalheim <Mic92@users.noreply.github.com>

Changed files
+38
doc
languages-frameworks
+38
doc/languages-frameworks/vim.section.md
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After that you can install your special grafted `myVim` or `myNeovim` packages.
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### What if your favourite Vim plugin isn't already packaged?
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If one of your favourite plugins isn't packaged, you can package it yourself:
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```
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{ config, pkgs, ... }:
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let
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easygrep = pkgs.vimUtils.buildVimPlugin {
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name = "vim-easygrep";
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src = pkgs.fetchFromGitHub {
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owner = "dkprice";
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repo = "vim-easygrep";
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rev = "d0c36a77cc63c22648e792796b1815b44164653a";
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sha256 = "0y2p5mz0d5fhg6n68lhfhl8p4mlwkb82q337c22djs4w5zyzggbc";
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};
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};
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in
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{
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environment.systemPackages = [
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(
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pkgs.neovim.override {
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configure = {
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packages.myPlugins = with pkgs.vimPlugins; {
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start = [
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vim-go # already packaged plugin
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easygrep # custom package
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];
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opt = [];
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};
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# ...
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};
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}
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)
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];
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}
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```
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## Managing plugins with vim-plug
To use [vim-plug](https://github.com/junegunn/vim-plug) to manage your Vim