Tools: reduce dependencies

[ralfhandl]

API Designer and API Explorer are rather fat (> 5MB):

> api-explorer@1.0.0 build
> parcel build --dist-dir ./dist/api-explorer

✨ Built in 64.24s

dist\api-explorer\index.html                       3.44 KB     1.90s
dist\api-explorer\rapid-mascot.82ffa289.png        4.21 KB     162ms
dist\api-explorer\index.ce519403.js            ⚠️  5.09 MB    55.16s
dist\api-explorer\index.f25624e2.css             286.13 KB     155ms

> api-designer@1.0.0 build
> parcel build --dist-dir ./dist/api-designer

✨ Built in 62.80s

dist\api-designer\index.html                       3.86 KB     1.41s
dist\api-designer\rapid-mascot.82ffa289.png        4.21 KB     120ms
dist\api-designer\index.75e65920.js            ⚠️  5.49 MB    53.57s
dist\api-designer\index.9d70d737.css             286.13 KB     142ms

Check dependencies and get rid of unnecessary ones.

See https://parceljs.org/features/production/#analyzing-bundle-sizes.