Modernize WebUI Gallery export

[marceloexc]

old webui gallery exporter did not work very well with mobile screens (everything appeared too small and not reactive)

kept the same hanatos style, but started using HTML standard elements (<header>, <footer>, <figure>, instead of everything being <div> <div> <div>...)

switched from xhtml to the html5 (no self closing tags for elements)

[TurboGit]

As we are at it... Can we have a bit more space of the main title and the start of the gallery:

[zisoft]

Would be nice to have templates with html and css files in a folder under config/darktable to give users a way to create their own galleries.
Like with the watermarks.

[marceloexc]

let me know what you think about the new padding vertically

[marceloexc]

Would be nice to have templates with html and css files in a folder under config/darktable to give users a way to create their own galleries. Like with the watermarks.

i agree. i think maybe having a templating engine would be a bit too much for the html but i definitely see having the css file available to change so that people can make their own colors, have a different grid layout etc.

unfortunately i dont know much about c so i can't volunteer for it. but it is a good idea

[TurboGit]

I don't have more spacing for the gallery title: