[feature-request] Add ability to use custom entry point

[IamSebastianDev]

Describe the missing feature

The ability to define a custom html file as entry Point, instead of just adding content to the body. We even could detect index.html files and derbe them automatically

Describe how the feature would improve Byndly

Byndly is already close to being a full dev server, this change would bring us even closer

Describe alternatives you've considered