docs: more examples

lua/plugins/example.lua

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+-- every spec file under config.plugins will be loaded automatically by lazy.nvim
+--
+-- In your plugin files, you can:
+-- * add extra plugins
+-- * disable/enabled LazyVim plugins
+-- * override the configuration of LazyVim plugins
+return {
+  -- change trouble config
+  {
+    "folke/trouble.nvim",
+    -- config = { use_diagnostic_signs = true },
+  },
+
+  -- add symbols-outline
+  {
+    "simrat39/symbols-outline.nvim",
+    cmd = "SymbolsOutline",
+    keys = { { "<leader>cs", "<cmd>SymbolsOutline<cr>", desc = "Symbols Outline" } },
+    config = true,
+  },
+
+  -- add zen-mode
+  {
+    "folke/zen-mode.nvim",
+    cmd = "ZenMode",
+    config = true,
+    keys = { { "<leader>z", "<cmd>ZenMode<cr>", desc = "Zen Mode" } },
+  },
+
+  -- use mini.starter instead of alpha
+  -- { "goolord/alpha-nvim", enabled = false },
+  -- { "echasnovski/mini.starter", enabled = true },
+}