The Benedictines at St. John’s in Collegeville, Minn., built the Vatican dot va site when the internet was a new thing in early 1998.
https://web.archive.org/web/19980130005011/http://www.vatican.va/
Having documents missing from Vatican dot va is not a big deal although it is easy to become suspicious. Pope Francis is not smart enough to understand Pope Pius IX and probably had it removed when he got flustered one day.
All the papal documents are located in books, libraries and web sites. Vatican dot va is not meant to be the only archive.
I am so sick of the "Francis is just an idiot" stance. These Modernists are evil. They are not stupid and they know full well what was taught pre-Vatican II: the Catholic Faith. They have been undermining the Faith and teaching and promoting a non-Catholic religion for decades.