Complete NSSAI configuration feature

Bump elliptic from 6.5.1 to 6.5.3 in /frontend

Bump websocket-extensions from 0.1.3 to 0.1.4 in /frontend

Able to edit subscriber information and realtime dashboard improvement

Increase AMBR and fix 5qi

Fix frontend development issues

of bandwidth testing

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.1 to 6.5.3.
- [Release notes](https://github.com/indutny/elliptic/releases)
- [Commits](https://github.com/indutny/elliptic/compare/v6.5.1...v6.5.3

)

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [websocket-extensions](https://github.com/faye/websocket-extensions-node) from 0.1.3 to 0.1.4.
- [Release notes](https://github.com/faye/websocket-extensions-node/releases)
- [Changelog](https://github.com/faye/websocket-extensions-node/blob/master/CHANGELOG.md)
- [Commits](https://github.com/faye/websocket-extensions-node/compare/0.1.3...0.1.4

)

Signed-off-by: dependabot[bot] <support@github.com>

Bump webpack-dev-server from 3.0.0 to 3.1.11 in /frontend

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 3.0.0 to 3.1.11.
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-dev-server/compare/v3.0.0...v3.1.11

)

Signed-off-by: dependabot[bot] <support@github.com>

New webuicfg config factory separate from udr

This separates the configuration of WebUI for UDR's. WebUI has now
its own config factory which loads the webuicfg.conf config file.