Update deps (#275)

Doing some safer ones (npm audit fix & some manual overrides).

Reduced total vulnerabilities flagged from 160 to 90 (9 low, 44
moderate, 11 high, 26 critical).

CSS changed due to `npm run build`.

Author: jpienaar

.gitignore

@@ -5,3 +5,4 @@ website/content/docs
 website/content/includes
 website/static/doxygen
 .hugo_build.lock
+**/node_modules/