Thank you. In a meanwhile I have figured it out.
I have solved my problem by retrieving server backup version of my site made a few days before.
Regarding articles that are stored inside of Joomla, is there any simple way to get hyperlink address for particular article so that I could embed it in to "Read more" hyperlink?
I.e. on the home page side there is Accordion module whit 3 dummy articles. Inside of each there is "Read more" link that points to certain categorized article (one per each accordion position).
I would like to change those links and point them to some other articles.
One way of doing it is to manually enter the link in the following form:
-> index.php/component/content/article/ category # - alias for category name / article # - alias article name
I'm wandering is there some smarter way to do so?