Merge Window-specific build-all section to common one

Author: Anrock

README.md

@@ -203,47 +203,38 @@ This will:
 * name them as expected by the VS Code plugin
 * build local hoogle docs for each version
 
-For this you need the `make` tool (on Windows, see the further advice below). Use the command:
+On non-Windows platforms use the command:
 
 ```bash
 make build-all
 ```
 
-Then add
-
-```json
-"languageServerHaskell.useCustomHieWrapper": true,
-"languageServerHaskell.useCustomHieWrapperPath": "hie-wrapper",
-```
-
-to VS Code user settings.
-
-#### Install *all* available GHC versions
-
-*Warning*: Requires 20+ GB of space and potentially more than 2 hours to install, so please be patient!
-
-This will:
-
-* install all supported GHC versions (8.2.1 - 8.6.3)
-* name them as expected by the VS Code plugin
-* build local hoogle docs for each version
-
-`make` doesn't work on Windows due to several UNIX-specific things, such
-as the `cp` command or extensionless executable names. Instead, a PowerShell
-script is provided specifically for this purpose:
-
+On Windows use:
 **PowerShell:**
 
 ```
 ./build-all.ps1
 ```
 
+or
+
 **cmd.exe:**
 
 ```
 powershell -ExecutionPolicy RemoteSigned -c ./build-all.ps1
 ```
 
+
+Then add
+
+```json
+"languageServerHaskell.useCustomHieWrapper": true,
+"languageServerHaskell.useCustomHieWrapperPath": "hie-wrapper",
+```
+
+to VS Code user settings.
+
+
 ### Installation on macOS
 
 Download the pre-built binaries from the [releases page](https://github.com/haskell/haskell-ide-engine/releases), and copy/symlink them into `/usr/local/bin` (or somewhere else in your $PATH):