refactor: move template/mkdir features to user-configured autocmds

- Remove auto-mkdir autocmd from init.lua (now user-configured)
- Remove template system entirely (now user-configured)
- Rename io.lua -> utils.lua
- Inline single-use functions (handle_web_link, handle_file_link, etc.)
- Remove security warnings for external files
- Remove unused config options: use_template, template, date_fmt
- Simplify utils.resolve() without wiki root validation
- Update all documentation examples
BREAKING CHANGE: Users must now add their own autocmds for:
- Auto-creating directories on save (BufWritePre)
- Applying templates to new files (BufNewFile)
See README.md for updated configuration examples.

1 files changed, 23 insertions, 5 deletions

diff --git a/README.md b/README.md
index 56c3ea6..c43671a 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,6 @@ A lightweight wiki plugin for Neovim using standard markdown syntax.
 - Standard markdown links `[text](url)`
 - Multiple wiki directories
 - External link handlers
-- Automatic template for new page
 - Link navigation with custom keymaps
 
 See `:help muwiki` for complete documentation and configuration options.
@@ -37,14 +36,16 @@ Using [lazy.nvim](https://github.com/folke/lazy.nvim):
     local muwiki = require('muwiki')
     muwiki.setup(opts)
 
-    local group = vim.api.nvim_create_augroup("MuWikiKeymaps", { clear = true })
+    local group = vim.api.nvim_create_augroup("muwiki", { clear = true })
 
+    -- Setup wiki keymaps for markdown files
     vim.api.nvim_create_autocmd("FileType", {
       group = group,
       pattern = "markdown",
-      callback = function(ev)
-        if not muwiki.wiki_root(ev.buf) then return end
-        local keymap_opts = { buffer = ev.buf, silent = true, nowait = true }
+      callback = function(args)
+        if not muwiki.wiki_root(args.buf) then return end
+
+        local keymap_opts = { buffer = args.buf, silent = true, nowait = true }
         vim.keymap.set('n', '<CR>', muwiki.open_link, keymap_opts)
         vim.keymap.set('n', '<Tab>', muwiki.next_link, keymap_opts)
         vim.keymap.set('n', '<S-Tab>', muwiki.prev_link, keymap_opts)
@@ -52,6 +53,23 @@ Using [lazy.nvim](https://github.com/folke/lazy.nvim):
         vim.keymap.set('n', '<leader>oo', muwiki.open_link_with, keymap_opts)
       end,
     })
+
+    -- Auto-create parent directories when saving files in wiki
+    vim.api.nvim_create_autocmd("BufWritePre", {
+      group = group,
+      callback = function(args)
+        local wiki_root = muwiki.wiki_root(args.buf)
+        if not wiki_root then return end
+
+        local file = args.file
+        if not vim.startswith(file, wiki_root) then return end
+
+        local dir = vim.fn.fnamemodify(file, ":h")
+        if vim.fn.isdirectory(dir) == 0 then
+          vim.fn.mkdir(dir, "p")
+        end
+      end,
+    })
   end,
 }
 ```