[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/bufferline.lua

@@ -17,7 +17,7 @@ bufferline.setup({
 		close_command = "Bdelete! %d",
 		right_mouse_command = "Bdelete! %d",
 		offsets = {
-			{ filetype = "neo-tree", text = "", padding = 1 },
+			{ filetype = "snacks_picker_list", text = "", padding = 1 },
 			{ filetype = "dapui_scopes", text = "", padding = 1 },
 		},
 		indicator = {
@@ -30,10 +30,7 @@ bufferline.setup({
 
 		custom_areas = {
 			left = function()
-				local text = ""
-				if not is_buffer_loaded("neo-tree") then
-					text = "  " .. string.gsub(vim.loop.cwd(), "^" .. os.getenv("HOME"), "~") .. "  "
-				end
+				local text = "  " .. string.gsub(vim.loop.cwd(), "^" .. os.getenv("HOME"), "~") .. "  "
 
 				return { { text = text, fg = "#adbac7" } }
 			end,