Install updates

[SableRaf]

This Pull request makes several improvements to the install page.

Quick Install

Processing 4.2 added the new pde:// protocol which allows you to open Processing sketches and contributions in the PDE directly from the browser. It builds up on the previous addition of bundled sketches and contributions with the .pdez and .pdex formats. This PR adds an install button which point at the .pdex file in the latest release using the custom pde:// uri protocol. The button includes a tooltip with more instructions. Also made some attempt at mobile detection to inform users that they may need to switch to a desktop computer to install the Android Mode.

Moved and consolidated the changelog to the What's New page

Changelog information has been moved to whatsnew.html. This keeps the Install page focused on information immediately useful for someone getting set up.

Moved the Android version requirements to the Install page

Android version requirements were moved to the install.html page. This is useful information for someone getting started.

Various Improvements

• Labelled the three installation methods as Option 1, 2, 3 for clarity
• Clarified the pre-releases header: "Installing pre-releases and older releases"

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