Update documentation.

- Convert http to https, provide archive link when possible.
- Made CPU-JIT.png more readable on dark themes;
Added a white background so there isn't black text on a black
background.

docs/building.md

@@ -12,7 +12,7 @@ video drivers for your card.
 * Visual Studio 2017 
 * Windows Universal CRT SDK
 * [Python 3.4+](https://www.python.org/downloads/)
-* You will also need the [Windows 8.1 SDK](http://msdn.microsoft.com/en-us/windows/desktop/bg162891) 
+* You will also need the [Windows 8.1 SDK](https://msdn.microsoft.com/en-us/windows/desktop/bg162891)
   * (for VS2017 just click the Windows 8.1 SDK option in the Individual Components section in the Visual Studio Installer)
 
 Ensure Python is in your PATH.
@@ -41,7 +41,7 @@ Linux support is extremely experimental and presently incomplete.
 The build script uses LLVM/Clang 3.8. GCC should also work, but is not easily
 swappable right now.
 
-[CodeLite](http://codelite.org) is the IDE of choice and `xb premake` will spit
+[CodeLite](https://codelite.org) is the IDE of choice and `xb premake` will spit
 out files for that. Make also works via `xb build`.
 
 To get the latest Clang on an ubuntu system: