Update _get-started-linux.html

[evilnick]

Done

adds the community addon to the linux install

QA

• Check out this feature branch
• Run the site using the command ./run serve
• View the site locally in your web browser at: http://0.0.0.0:8027/
• Run through the following QA steps

Issue / Card

Fixes #634, Fixes #646

Screenshots

[if relevant, include a screenshot]

[webteam-app]

Demo

Jenkins

demos.haus

[evilnick]

• there are some additional things which will fix the other issue

[evilnick]

Also fixes #646

[evilnick]

Removed istio entirely due to new information