use vscode-markdown-it-katex to render kaTex

[ZekeLu]

1. it bundles the extension with esbuild to reduce the size of the extension (from 9.8M to 1.5M).
2. it renders KaTex with @vscode/markdown-it-katex which is the same one used by VS Code.

Fixes #17, #21, #167, #355.
And it's an alternative to #198.

Anyone who wants to try it, download the extension from https://github.com/ZekeLu/vscode-markdown-pdf/releases/tag/1.5.1 and install it manually.

[samantonio28]

i tryed to install this, it started downloading Chromium, is it ok that it takes so much time? Will it work after installing Chromium?
Also I got the error that the file in c/.../node_modules/... doesn't exist. I tryed to copy all node_modules directory on the level of README-s to fix it, I don't know if this behavior is correct :)

[samantonio28]

so, i copied node_modules from 1.5.0. version, installed Chromium and now it's works :)