Allow configuring specific headers in theme

[jaspervdj]

In addition to header, individual headers can now also be customized. The configuration blocks under headers accepts a style list, a prefix string and an underline string that is repeated match the width of the header.

For example:

patat:
  theme:
    headers:
      h3:
        style: [vividRed]
        prefix: '### '
        underline: '-~-~'

See #81

[jaspervdj]

@halloleo Would this work for your use case? Are there other parameters that you think would be useful?

[halloleo]

Ah, I see, there is a new attribute "headers"! Cool!

@halloleo Would this work for your use case?

Yes, it certainly would. (I'd just set prefix: '')

Are there other parameters that you think would be useful?

Well, one thing I really would like is the option to center the headers (but just the headers). My headers are often rather short, so that they make the slides "left-heavy".

(For my current presentation I center the whole slide deck, just because of this visual imbalance, but I really only want to center the headers,)

[tacerus]

I would appreciate this change as well!

[jaspervdj]

Thanks for the gentle nudge. I wanted to add centered headers to this as well before merging. I added the implementation for that just now. It just needs a few more doc/tests bump and then I will merge and put this in a release.

[tacerus]

Thanks for the great work. :)

[jaspervdj]

This is included in v0.15.2.0.

[halloleo]

Thanks @jaspervdj for doing this. Will certainly use it.