Improve the 404 page

[gkwan-ibm]

e.g. when visit https://openliberty.skillsnetwork.site/quicklab/, it returns as

Need to improve this 404 page, add link(s) to openliberty.io site and/or OLSN home page.

[jakub-pomykala]

Message Michael Lin to see if it would be possible.

Will update this issue once I have an answer.

[jakub-pomykala]

Skills Network do not have any plans for the near future to update the cosmetics stuff of the site.

This is a generic error site that is used by every portal not just OL-SN. So we can not customise it ourselves.

@jamiecoleman92 @gkwan-ibm