HOLI-7741: host drawio viewer locally to avoid tracking by CDN
the JS file is just mirrored from https://github.com/xiguaxigua/docusaurus-plugin-drawio/blob/master/viewer.min.js
Edited by Alex Timmermann
the JS file is just mirrored from https://github.com/xiguaxigua/docusaurus-plugin-drawio/blob/master/viewer.min.js