Doesn't work for custom SVGs

[rafaelmendoncavaz]

Describe the bug
The generated URL is simply too long when you add custom SVGs. I built one with just 2 lines and it generated an URL over 40k characters long. Even tinyurl can't handle it (max 32k), browsers also say the URL is too long.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Go to 'do your stuff and go to step 6/7 '
3. Add 'about 11 svgs about ~3KiB across two lines'
4. Generate a Titanoboa type of URL

Expected behavior
It should generate a 'way shorter URL' capable of being read. Or at least, it should generate a PNG image that you could download and add it to a shorter link.