SVG is not disabled in Tor Browser based on ESR52
SVG is not disabled anymore on our highest security level in ESR 52-based nightly builds. I.e. https://upload.wikimedia.org/wikipedia/commons/6/6c/Trajans-Column-lower-animated.svg renders in my Tor Browser.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information