[FEAT] Update method for getting speedtest server id's

[misterjtc]

Is this a new feature request?

• [X] I have searched the existing issues

Wanted change

Update the documentation and unraid template to use the link https://c.speedtest.net/speedtest-servers-static.php to get the server list instead of the docker exec command.

Reason for change

Its much easier to use the link than run a docker exec command for a docker that you don't have yet.

Proposed code change

No response

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