Update Google Home article

[sa2000a]

This PR updates the Google Home to remove all the commands that are no longer supported and also updates the setup linked web pages and steps.

I expect there will be several iterations to get this right and I would like it to be reviewed and first to be checked for accuracy by @hatharry Please check for:

• accuracy
• I have not removed commands that should still work
• the sequence of steps is the right order
• the correct forum area/topic to give feedback in whilst it is in alpha stage.

We will need to change the article when we come out of alpha and the skill will be visible in the list for Google Home by default

@LukePulverenti please do not merge until the review by @hatharry and revisions have completed

[sa2000a]

@hatharry I did not mention in the article if the emby account needs to be server admin account. we should cover this as well