docs: migrating docs from readme

docs/installation.md

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+---
+sidebar_position: 2
+---
+# 🔥 Installation
+
+You can add the following Lua code to your `init.lua` to bootstrap **lazy.nvim**:
+
+<!-- bootstrap:start -->
+
+```lua title="lua/config/lazy.lua"
+local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
+if not (vim.uv or vim.loop).fs_stat(lazypath) then
+  vim.fn.system({
+    "git",
+    "clone",
+    "--filter=blob:none",
+    "https://github.com/folke/lazy.nvim.git",
+    "--branch=stable", -- latest stable release
+    lazypath,
+  })
+end
+vim.opt.rtp:prepend(lazypath)
+```
+
+<!-- bootstrap:end -->
+
+Next step is to add **lazy.nvim** below the code added in the prior step in `init.lua`:
+
+```lua
+require("lazy").setup(plugins, opts)
+```
+
+- **plugins**: this should be a `table` or a `string`
+  - `table`: a list with your [Plugin Spec](#-plugin-spec)
+  - `string`: a Lua module name that contains your [Plugin Spec](#-plugin-spec). See [Structuring Your Plugins](#-structuring-your-plugins)
+- **opts**: see [Configuration](#%EF%B8%8F-configuration) **_(optional)_**
+
+```lua
+-- Example using a list of specs with the default options
+vim.g.mapleader = " " -- Make sure to set `mapleader` before lazy so your mappings are correct
+vim.g.maplocalleader = "\\" -- Same for `maplocalleader`
+
+require("lazy").setup({
+  "folke/which-key.nvim",
+  { "folke/neoconf.nvim", cmd = "Neoconf" },
+  "folke/neodev.nvim",
+})
+```
+
+ℹ️ It is recommended to run `:checkhealth lazy` after installation.
+