chore(site): Make it easier to preview changes
chore(site): Make it easier to preview changes

The existing `grunt test` didn't work, there seem to be no tests
for the website.

stryker-mutator/stryker-mutator.github.io,stryker-mutator/stryker-mutator.github.io,stryker-mutator/stryker-mutator.github.io,stryker-mutator/stryker-mutator.github.io