Include libraries via CDN instead of embedding

[kordwarshuis]

• What: JavaScript libraries are embedded in the index.html at the moment.
• Why: the index.html is growing (for example after updating mermaid.js library) and gulp compile takes a very long time, also the size of index.html goes over 5 MB if many terms
• When: after discussing with @henkvancann
• What way: Remove files like mermaid.js and add a link to CDN in HTML template
• Where: https://github.com/trustoverip/spec-up-t/tree/master/assets

Libraries:

• mermaid.js
• chart.js
• popper.js
• tippy.js
• prism.js
• notyf.js
• font-awesome.js

And new to add:

• bootstrap.css / bootstrap.js

Pro:

• Faster site
• Smaller site
• Easier to maintain

Con:

• If CDN is down, the site does not work