Remove _data/sites/*.js "default" files from repository for easer fork install/update about speedlify

[TigersWay]

I thought skip: !process.env.CONTEXT || process.env.SITE_NAME !== "speedlify" was there just for that purpose...

[nhoizey]

Hum… my process must be broken then, I'll try once again and report if this work as intended!

[nhoizey]

Ok, I think my fork update was a little too extreme, it removed my own personal sites configurations… 🤦‍♂️

How do you update yours?

I was also reading "After cloning you’ll probably want to delete the initial _data/sites/*.js files and create your own file with a list of your own site URLs!" in the README and jumped to a bad conclusion.

[TigersWay]

All _data/sites/*.js but the sample one have that skip flag... I believe I used that one the first time 😄
Then I added new ones. @zachleat's original files are still there.

[nhoizey]

Looks like you're right, the "The default sites that get tested" is active by default, we have to remove it:
https://webperf-monitoring.netlify.app/