@Anthony_Tonev Hmm ... well so far I only animated vector illustrations for video purposes rather than website design (hence the use of Media Encoder). From what I can gather, Adobe Animate appears to be a more suitable program to produce svg animations for web-based projects although I haven't tested it myself.
In terms of importing svg in AE, I too suffered from that problem until recently when I acquired Illustrator. Previously, I would ask a friend to convert the svg to ai; however, it slows down production whenever I needed to alter the vector graphic and thus have to send it back to my friend to convert. Later I realized I could export the vector graphic as pdf (with components in separate pages), which AE supports, and animate that instead. Now with Illustrator I no longer have to go through those extra steps which is a HUGE time saver.
Looking into Greensock.js, the library seems promising for constructing rather complex scenes. And heck, even simple animations when used in conjunction with other graphical elements could produce intriguing sites to wow one's visitors. I'm sure that if you decide to utilize the library you could produce stunning and interactive animations like what you did for your Music Box Editor (you did a fantastic job by the way; it's actually quite fun).