[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/snacks.lua

@@ -0,0 +1,42 @@
+require("snacks").setup({
+	animate = {},
+	bigfile = {},
+	explorer = {},
+	indent = {
+		indent = { char = "▏" },
+		scope = { char = "▏" },
+	},
+	scroll = {},
+	gitbrowse = {},
+	image = {},
+	dashboard = {
+		sections = {
+			{ section = "header" },
+
+			{ icon = "", desc = "Projects", action = ":Telescope neovim-project", key = "p", padding = 1 },
+
+			{ icon = "", key = "n", desc = "New File", action = ":ene | startinsert" },
+			{
+				icon = "",
+				desc = "Recent Files",
+				action = ":lua Snacks.dashboard.pick('oldfiles')",
+				key = "r",
+			},
+			{ icon = "", key = "q", desc = "Quit", action = ":qa", padding = 1 },
+
+			{ icon = "", title = "Config" },
+			{
+				icon = "󰒲",
+				desc = "Lazy",
+				action = ":Lazy",
+				enabled = package.loaded.lazy ~= nil,
+				key = "l",
+				indent = 2,
+			},
+			{ icon = "", desc = "Mason", action = ":Mason", key = "m", indent = 2 },
+			{ icon = "", desc = "Tree-sitter", action = ":TSUpdate", key = "t", indent = 2, padding = 2 },
+
+			{ section = "startup" },
+		},
+	},
+})