Update readme with install script

[o-psi]

Updated README.MD to show updated install instructions.

[wrongecho]

Test these changes at: https://Updatereadmewithinstallscript737.pr-review.itflow.org
(automatic message)

[wrongecho]

Hey @o-psi, thanks for the PR!

The install script is definitely the recommended method to install, it's so much quicker than manually installing Apache and cloning everything yourself. I've just made a few small tweaks:

• The security/in development message is already shown further up ("In beta") so doesn't need to be shown again.

• Moved the security policy link to the top header to make it more visible.

• Combine the download/install commands into one

[wrongecho]

Approved with tweaks

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[o-psi]

Thanks @wrongecho. I slightly modified the script output the wget as standard output, and pipe into bash directly, avoiding saving the script unless the user actually wants to.

[wrongecho]

Nice work! Thank you :)