docs: rearrange, esp. about folding

README.md

@@ -68,27 +68,29 @@ pip3 install --upgrade pip
 
 ### Install Jupynium
 
+<details>
+<summary>
+Click to see vim-plug and packer installation.
+</summary>
+
 With vim-plug:
 
 ```vim
 Plug 'kiyoon/jupynium.nvim', { 'do': 'pip3 install --user .' }
 " Plug 'kiyoon/jupynium.nvim', { 'do': 'conda run --no-capture-output -n jupynium pip install .' }
-Plug 'hrsh7th/nvim-cmp'       " optional, for completion
 Plug 'rcarriga/nvim-notify'   " optional
 Plug 'stevearc/dressing.nvim' " optional, UI for :JupyniumKernelSelect
-Plug 'kevinhwang91/nvim-ufo'  " optional, folds for :lua require("jupynium").get_folds()
 ```
 
 With packer.nvim:
 
 ```lua
 use { "kiyoon/jupynium.nvim", run = "pip3 install --user ." }
 -- use { "kiyoon/jupynium.nvim", run = "conda run --no-capture-output -n jupynium pip install ." }
-use { "hrsh7th/nvim-cmp" }       -- optional, for completion
 use { "rcarriga/nvim-notify" }   -- optional
 use { "stevearc/dressing.nvim" } -- optional, UI for :JupyniumKernelSelect
-use { "kevinhwang91/nvim-ufo" }  -- optional, folds for :lua require("jupynium").get_folds()
 ```
+</details>
 
 With 💤lazy.nvim:
 
@@ -99,10 +101,8 @@ With 💤lazy.nvim:
     -- build = "conda run --no-capture-output -n jupynium pip install .",
     -- enabled = vim.fn.isdirectory(vim.fn.expand "~/miniconda3/envs/jupynium"),
   },
-  "hrsh7th/nvim-cmp",       -- optional, for completion
   "rcarriga/nvim-notify",   -- optional
   "stevearc/dressing.nvim", -- optional, UI for :JupyniumKernelSelect
-  "kevinhwang91/nvim-ufo",  -- optional, folds for :lua require("jupynium").get_folds()
 ```
 
 #### Configure Jupynium
@@ -261,6 +261,17 @@ cmp.setup {
 }
 ```
 
+#### Optionally, configure `nvim-ufo` to fold cells
+
+There is an API serving as a folds provider, which will return a table with format `{startLine=#num, endLine=#num}`.  
+
+```lua
+require("jupynium").get_folds()
+```
+
+You should use it with a fold plugin like [nvim-ufo](https://github.com/kevinhwang91/nvim-ufo).  
+See [#88](https://github.com/kiyoon/jupynium.nvim/pull/88) for more detail and an example configuration.
+
 ## 🏃 Quick Start
 
 - Open a `*.ju.py` file.
@@ -488,13 +499,6 @@ if status_ok then
 end
 ```
 
-There is also an API serving as a folds provider(see [#88](https://github.com/kiyoon/jupynium.nvim/pull/88) for more detail), which will return a table with format `{startLine=#num, endLine=#num}`.
-
-```lua
-require("jupynium").get_folds()
-```
-
-You should use it with a fold plugin like [nvim-ufo](https://github.com/kevinhwang91/nvim-ufo), an example is [example config](https://github.com/fecet/nvim/blob/6d8606987b73d03a7c7dc802065303b9ed09dcdb/lua/modules/configs/editor/ufo.lua).
 ## 👨‍💻️ Command-Line Usage (attach to remote Neovim)
 
 **You don't need to install the vim plugin to use Jupynium.** The plugin is responsible of adding `:JupyniumStartAndAttachToServer` etc. that just calls the command line program, plus it has textobjects and shortsighted support.