Ignore twitter link in html tests

[gongmax]

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[roberthbailey]

@markmandel FYI (in case we want to try and revert this later)

The html site tests are currently failing trying to follow our link to the agones twitter account. While twitter seems to load just fine in a web browser, running curl against it ends up in a redirect loop:

$ curl -L https://twitter.com/agonesdev
curl: (47) Maximum (50) redirects followed
```

Since this is blocking CI, we are going to merge this to make sure that we can get other changes in and that we can cut a release next week. 

[roberthbailey]

Unit tests passed (e2e tests were cancelled). I'm going to merge this so that de-flaking efforts can focus on e2e testing and not the strange twitter redirect loop.