refactor: move lazy setup so user never touches init.lua

lua/lazy_setup.lua

@@ -0,0 +1,29 @@
+require("lazy").setup({
+  {
+    "AstroNvim/AstroNvim",
+    branch = "v4", -- TODO: change `branch="v4"` to `version="^4"` on release
+    import = "astronvim.plugins",
+    opts = { -- AstroNvim options must be set here with the `import` key
+      mapleader = " ", -- This ensures the leader key must be configured before Lazy is set up
+      maplocalleader = ",", -- This ensures the localleader key must be configured before Lazy is set up
+      icons_enabled = true, -- Set to false to disable icons (if no Nerd Font is available)
+      pin_plugins = nil, -- Default will pin plugins when tracking `version` of AstroNvim, set to true/false to override
+    },
+  },
+  { import = "community" },
+  { import = "plugins" },
+} --[[@as LazySpec]], {
+  install = { colorscheme = { "astrodark", "habamax" } },
+  performance = {
+    rtp = {
+      -- disable some rtp plugins, add more to your liking
+      disabled_plugins = {
+        "gzip",
+        "netrwPlugin",
+        "tarPlugin",
+        "tohtml",
+        "zipPlugin",
+      },
+    },
+  },
+} --[[@as LazyConfig]])