Consulting: remove some dead entries

• ish pty appears to be an educational services company. No references to FreeBSD or any other unix offering can be found on their website.

• PythonByte's domain is for sale.

• JCR's website is non-existent. Google shows no alternative.

• Gurix's website has changed and does not appear to be a consulting company anymore.

• Green IT is a parked domain.

• Frigate Network's website is non-existent. Google shows no alternative.

• AaronSEN is a parked domain.

• Adimus is a web server without content.

• Codeangels Solutions's website is non-existent.

• ibermachines's website is non-existent.

• raditex's website has changed (website updated; not removed)

I am not removing entries of companies whose website redirects to
different, but existing company. Some appears to have been bought
or renamed, but I am trying to be conservative.