Move installation instructions to INSTALL.md

INSTALL.md is read by the draculatheme.com website generator, so this change will make all instructions point to the same information.

Author: waf

README.md

@@ -8,50 +8,7 @@
 
 ## Installation
 
-There are 4 parts to configure; all of them are optional:
-
-
-<details><summary><strong>Colors Installation</strong></summary>
-<p>
-
-1. [Download and unzip](https://raw.githubusercontent.com/waf/dracula-cmd/master/dist/ColorTool.zip) ColorTool. The [source code](https://github.com/Microsoft/Terminal/tree/master/src/tools/ColorTool) is available from Microsoft.
-1. Open PowerShell, navigate to unzipped `ColorTool` directory, and run `install.cmd`.
-1. Right-click on the window titlebar and choose `Properties`, then on the `Font` tab choose Consolas. Click `OK` to save.
-    - Note that this step is required, even if your font is already set to Consolas, due to the way that the windows console saves its settings.
-
-For cmd.exe support, perform the same steps above but in a cmd.exe window.
-
-</p>
-</details>
-
-<details><summary><strong>PowerShell Prompt</strong></summary>
-<p>
-
-1. Install the 1.0 version of posh-git.
-    - It's currently prerelease, so you'll need to install it with `Install-Module -Name posh-git -AllowPrerelease -Force`
-    - If you don't have an `-AllowPrerelease` flag, upgrade PowerShellGet with `Install-Module -Name PowerShellGet -Force` first.
-1. Ensure the latest version of PSReadLine (2.0 or later) is installed. It's installed by default in Windows 10, but you'll most likely [need to upgrade it](https://github.com/lzybkr/PSReadLine#user-content-upgrading).
-    - You can verify that 2.0 was installed by running `(Get-Module PSReadLine).Version`. If the installation does not appear to work, please see [this issue in PSReadLine](https://github.com/PowerShell/PowerShellGet/issues/318#issuecomment-418605987)
-1. Include [this powershell configuration](https://github.com/dracula/powershell/blob/master/theme/dracula-prompt-configuration.ps1) in your PowerShell `$profile` file.<sup>[1](#profile-explanation)</sup>
-
-</p>
-</details>
-
-<details><summary><strong>CMD.exe Prompt</strong></summary>
-<p>
-
-Set the environment variable `prompt` to `$E[1;32;40m→ $E[1;36;40m$p$E[1;35;40m› $E[1;37;40m`
-
-</p>
-</details>
-
-<details><summary><strong>Windows Titlebar Color</strong></summary>
-<p>
-
-In Windows 10, the titlebar color can be set system-wide in Settings → Personalization → Colors → Custom color → More → #262835.
-
-</p>
-</details>
+See our [installation instructions here](https://github.com/dracula/powershell/blob/master/INSTALL.md).
 
 ## Support for other terminals