[neovim] replace neo-tree with snacks.nvim

Replace neo-tree.nvim with snacks.nvim for file explorer functionality and
remove several other plugins including:
- mini-animate
- mini-starter
- indent-blankline

The snacks.nvim plugin provides better file explorer, dashboard, indentation
guides, and other UI improvements in a more cohesive package.

Also removed the large file autocommand as snacks.nvim handles this with its
bigfile module.

.config/nvim/lua/plugins/noice.lua

@@ -53,17 +53,5 @@ require("noice").setup({
 			},
 			opts = { skip = true },
 		},
-		{
-			view = "popup",
-			filter = {
-				find = "File larger than",
-			},
-			opts = {
-				size = {
-					width = 100,
-					height = 4,
-				},
-			},
-		},
 	},
 })