You can post your own content on the xloud.
Just put up a TeX file on GitHub using \documentclass{ximera}.
For example, in the repository mooculus/calculus, there is a file derivativesOfInverseFunctions/digInDerivativesOfInverseTrigonometricFunctions.tex. It uses \documentclass{ximera}.
By going to https://ximera.cloud/mooculus/calculus/derivativesOfInverseFunctions/digInDerivativesOfInverseTrigonometricFunctions, your browser will download the necessary files, compile the .tex file, and render it.
tl;dr: go to https://ximera.cloud/username/repository/pathname
nixops create ./aws.nix -d xloud nixops deploy -d xloud