Make content wider, Update some pages

[m1ga]

• increase content width from 740px to 900px (wider makes it a bit harder to read, lines are too long)
• fixed https://titaniumsdk.com/guide/Alloy_Framework/Alloy_Guide/Alloy_Concepts.html#alloy-and-the-titanium-sdk table
• removed some warning blocks
• removed some download images (those big green down arrows)
• cleaned up Compatibility matrix
• removed version numbers from https://titaniumsdk.com/guide/Titanium_SDK/Titanium_SDK_Getting_Started/Prerequisites/ and linked to Compatibility matrix right away. So we only have to maintain one list of version numbers
• updated links in https://titaniumsdk.com/guide/Titanium_SDK/Titanium_SDK_Guide/Welcome_To_Titanium/Titanium_Resources.html

To see the real page you can use the Preview rich diff (the :page_facing_up: icon on the top right side of the file view) to see the differences in markdown mode.

[m1ga]

Updated the last parts:

• removed all gperf/git links and pages
• jdk -> ndk mistake
• adjusted the headline on the support page