chore(build): auto-generate vimdoc

doc/lazy.nvim.txt

@@ -68,14 +68,10 @@ You can add the following Lua code to your `init.lua` to bootstrap
 >lua
     local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
     if not vim.loop.fs_stat(lazypath) then
-      vim.fn.system({
-        "git",
-        "clone",
-        "--filter=blob:none",
-        "--branch=stable", -- remove this if you want to bootstrap to HEAD
-        "https://github.com/folke/lazy.nvim.git",
-        lazypath,
-      })
+      if not vim.loop.fs_stat(lazypath) then
+        vim.fn.system({ "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", lazypath })
+        vim.fn.system({ "git", "-C", lazypath, "checkout", "tags/stable" }) -- last stable release
+      end
     end
     vim.opt.rtp:prepend(lazypath)
 <