Remove the Installation problems chapter

[jimwins]

References should link to faq.installation instead (related to php/doc-en#3785)

[Girgias]

@saundefined seems doc-ru hasn't applied the corresponding doc-en change.

[saundefined]

@Girgias weird, I can't stop workflow to re-run it (or rather I can, but it doesn't stop :) ) (upd: now it's ok)

I updated the doc-ru and applied this patch locally, the build was successful.

Thanks!