Easily composable "info" landing page (HTTP app)

[vkottler]

Use-case: a single landing page for multiple web application's (see links + description's that can be used for navigation.

May as well be capable of other content generation features (documentation style).

Feature should definitely expose a "register external method" interface.

Possible drop-in idea: serve app from e.g. /app.html ... maybe the default application should redirect here? If no config data powering "landing page", otherwise serve some static data (always include link to actual app).

[vkottler]

#240 WIP

[vkottler]

Enhancing the server command + http server combo to make this ergonomic at the command-line is probably a better option.

[vkottler]

Do this first: #248.

[vkottler]

#252 refines this idea further, "config-driven UI content" should definitely be a feature but this other issue describes the higher ROI (and more significant amount of work) area of the application.