refactor: frontmatter for markdown;

feat: plugin for rendering images in markdown;
feat: pastify;
feat: markdown preview in browser

nvim/lua/plugins/markdown-preview.lua

@@ -0,0 +1,11 @@
+return {
+  {
+    "iamcco/markdown-preview.nvim",
+    cmd = { "MarkdownPreviewToggle", "MarkdownPreview", "MarkdownPreviewStop" },
+    build = "cd app && npm install",
+    init = function()
+      vim.g.mkdp_filetypes = { "markdown" }
+    end,
+    ft = { "markdown" },
+  },
+}