Website healthcheck v3 release

Thanks to @delitescere there are a few optimisations in v3:

• Follow redirects
• Remove need for head and awk getting status code.
• Use scan_text variable in grep
• Use exit code from grep instead of possibly erroneous (because value wasn't surrounded in quotes) -z test (this error prompted the change)
• Output errors to stderr
• Explicitly exit 0

Website Healthcheck v2 release

This version contains:

• Fix of permission denied error
• Added branding
• Updated readme