thx @sigaloid
* Add download button to shared canvases
* Update canvas_note_share.js
* Update canvas_note_share.js
* Update canvas_note_share.js
* Change to more accurate language
* Add clientside mermaid chart rendering
Merry Christmas :)
* Add katex math rendering client-side
* Update page.ejs
* Revert (wrong branch)
* Add children nodes to all notes under hr
* Add parent note button
* Add note type in child note info
* Fix parent, relative paths
* Add code rendering, fix space in HTML class