refactor: restructure init.lua to use lazy plugin manager and add lsp configurations

lua/plugins/lsp.lua

@@ -0,0 +1,70 @@
+return {
+	-- default lsp configs
+	{
+		"neovim/nvim-lspconfig",
+		config = function() end,
+	},
+
+	-- lsp installer
+	{
+		"williamboman/mason.nvim",
+		dependencies = {
+			"williamboman/mason-lspconfig.nvim",
+		},
+		cmd = "Mason",
+		config = function()
+			-- mason
+			require("mason").setup({
+				ui = {
+					icons = {
+						package_installed = "✓",
+						package_pending = "➜",
+						package_uninstalled = "✗",
+					},
+					border = "rounded",
+					backdrop = 100,
+				},
+			})
+			require("mason-lspconfig").setup({
+				-- list of servers for mason to install
+				ensure_installed = {
+					"ts_ls",
+					"html",
+					"cssls",
+					"tailwindcss",
+					"lua_ls",
+					"basedpyright",
+					"bashls",
+					"clangd",
+					"pylsp",
+					"rust_analyzer",
+				},
+				-- auto-install configured servers (with lspconfig)
+				automatic_installation = true, -- not the same as ensure_installed
+			})
+		end,
+	},
+	{
+		"nvimdev/lspsaga.nvim",
+		event = "LspAttach",
+		config = function()
+			require("lspsaga").setup({
+				ui = {
+					theme = "round",
+					border = "rounded",
+					devicon = true,
+					title = true,
+					winblend = 1,
+					expand = " ",
+					collapse = " ",
+					preview = "",
+					code_action = "󰠠 ",
+					diagnostic = " ",
+					incoming = " ",
+					outgoing = " ",
+					hover = " ",
+				},
+			})
+		end,
+	},
+}