The most common thing that we do with fab! is:
fab!(:thing) { Fabricate(:thing) }
This commit adds a shorthand for this which is just simply:
fab!(:thing)
i.e. If you omit the block, then, by default, you'll get a `Fabricate`d object using the fabricator of the same name.
JS tests expect `show_copy_button_on_codeblocks` to be false (because
default before #81f3f56 was false). There is probably a different
issue at play here with JS tests, I haven't dug into it yet.
Instead, this PR adds a system test to ensure copy button is present
for code blocks with default site settings enabled.
Clicking on TOC heading anchors in a subfolder setup was breaking the current URL for users.
Other than the fix this change introduces the ability to test the subfolder setup in system specs.
