lsp: remove lsp installer

It is a bad idea to manage lsp exeutable by an editor plugin. In linux,
we have more reliable package manager. I don't want a python pip like
plugin. Besides, this project is no more under maintained as the
upstream start working a new alternative: meson.nvim. It's hard to trust
a upstream that abandon and rename themselves three times.

Signed-off-by: Avimitin <[email protected]>

README.md

@@ -99,10 +99,6 @@ Please read [**NVIM GUIDANCE**](https://avimitin.github.io/nvim).
 |----------------------------------------------------|
 | ![cmp-cmdline](./docs/images/nvim-cmp-cmdline.png) |
 
-| Easy install language server                                                                                       |
-|--------------------------------------------------------------------------------------------------------------------|
-| ![lspserver](https://user-images.githubusercontent.com/6705160/150685720-782e33ba-172c-44b6-8558-fb4e98495294.png) |
-
 | Inline diagnostic analytics |
 |-----------------------------|
 | ![lsp-line](./docs/images/inline.png) |

docs/src/en_us/workflows/lspconfig.md

@@ -56,11 +56,11 @@ local custom = {
 return custom
 ```
 
-You can use command `:LspInstall <Language>` to install new lspserver.
-This command is provided by [nvim-lsp-installer](https://github.com/williamboman/nvim-lsp-installer).
-And you can use the `:LspInstallInfo` to use a panel to manage the servers.
+Install the server by your system package manager, and add the executable name
+into the custom.lua file.
 
-> * Rust server is also automatically installed and set up by rust-tools.nvim.
+> * Rust server is automatically installed and set up by rust-tools.nvim.
+> Don't add the rust-analyzer executable here.
 > For detail please read [Rust.md(WIP)](../plugins/rust.md)
 > * Lua server is installed and pre-configured by default, you don't need to configured it too.
 

lua/plugins/coding/config/lspconfig.lua

@@ -95,22 +95,6 @@ for type, icon in pairs(signs) do
   })
 end
 
--- [[ =================================================================================
---  LSP SETUP MAIN LOGIC
--- =================================================================================]]
-
-require("nvim-lsp-installer").setup({
-  -- only ensure Lua language server is installed
-  automatic_installation = true,
-  ui = {
-    icons = {
-      server_installed = "✓",
-      server_pending = "➜",
-      server_uninstalled = "✗",
-    },
-  },
-})
-
 -- Preconfigured language server that will be **automatically** installed.
 --
 -- WARNING: rust-analyzer is set up by plugin "rust-tools.nvim", *DONT*

lua/plugins/coding/repos.lua

@@ -29,13 +29,6 @@ local repos = {
     after = "nvim-treesitter",
   },
 
-  -- automatically download and manage lsp server
-  {
-    "williamboman/nvim-lsp-installer",
-    -- setup by lspconfig in lspconfig_cfg.lua file
-    module = "nvim-lsp-installer",
-  },
-
   -- manage the lsp server
   {
     "neovim/nvim-lspconfig",