[ENHANCEMENT]: Update README and additional descriptions in frontend before v1.0.0

[s3inlc]

Description

Before the final 1.0.0 release, following things should be updated/checked in the frontend repository:

• LICENCE.md: can be removed (the license exists at LICENSE)
• README.md: update (as there is no beta anymore and it will be production)
• STYLE_GUIDE.md: very likely is highly outdated, should be updated
• CONTRIBUTING.md, DEVELOPMENT.md and CODE_OF_CONDUCT.md: should be checked and updated where necessary