Denops eco-system doesn't support expanding into a single directory

[lambdalisue]

Describe the bug

If denops.vim and denops plugins are expanded into a single directory, deno.json will be overwritten and deno.json under @denops-private won't be a member of workspace and that cause denops start-up error.

Provide a minimal vimrc with less than 50 lines to reproduce

How to reproduce the problem from Vim startup

Expected behavior

Actual behavior

Screenshots (if need)

Your environment

• OS: uname -a (macOS/Linux) or ver (Windows)
• Deno version: deno --version
• Vim/Neovim version: vim --version or nvim --version
• Denops version: git log -1 (run in the denops.vim repository)

Additional context