Update Install.md

- remove references to cmake

INSTALL.md

@@ -6,9 +6,8 @@ To build Element iOS project you need:
 
 - Xcode 12.1+.
 - [Ruby](https://www.ruby-lang.org/), a dynamic programming language used by several build tools.
-- [cmake](https://gitlab.kitware.com/cmake/cmake), used to build [cmark](https://github.com/commonmark/cmark) dependency of [MatrixKit](https://github.com/matrix-org/matrix-ios-kit) pod.
 - [CocoaPods](https://cocoapods.org), library dependencies manager for Xcode projects.
-- [Homebrew](http://brew.sh/) (recommended), is a package manager for macOS that can be used to install cmake.
+- [Homebrew](http://brew.sh/) (recommended), is a package manager for macOS.
 - [bundler](https://bundler.io/) (optional), is also a dependency manager used to manage build tools dependency (CocoaPods, Fastlane).
 
 ### Install Ruby
@@ -17,15 +16,6 @@ Ruby is required for several build tools like CocoaPods, bundler and fastlane. R
 
 If you do not want to grant the ruby package manager, [RubyGems](https://rubygems.org/), admin privileges and you prefer install gems into your user directory, you can read instructions from the CocoaPods [guide about sudo-less installation](https://guides.cocoapods.org/using/getting-started.html#sudo-less-installation).
 
-### Install cmake
-
-There are several ways to install cmake, downloading binary from [official website](https://cmake.org/download/) or using a package manager like [MacPorts](https://ports.macports.org/port/cmake/summary) or [Homebrew](http://brew.sh/).
-To keep it up to date, we recommend you to install cmake using [Homebrew](http://brew.sh/):
-
-```
-brew install cmake
-```
-
 ### Install CocoaPods
 
 To install CocoaPods you can grab the right version by using `bundler` (recommended) or you can directly install it with RubyGems: