DOC: remove layout overrides for headers

[eric-wieser]

Addresses gh-18321.

Also fixes a typo where font-style instead of font-family was used. Since the font boldness and letter-spacing choices were built on top of this mistake, they were removed too.

If someone feels the pydata-sphinx-theme would look nicer with some layout tweaks, I would strongly encourage them to adjust the theme itself upstream.

Before:

After:

[seberg]

I don't think you should undo the font-weight, I think it is identical to the numpy.org one. I am not sure about the letter spacing

[eric-wieser]

I can't find a matching font-weight in numpy.org/css/styles.css, but if we pick a matching one that feels very sensible.

Regarding letter spacing, I removed that because the choice varies dramatically with the font, and the old choice was accidentally made with the wrong font.

[seberg]

href="https://fonts.googleapis.com/css?family=Lato:400,900" I thought the 900 was it, but it was just a guess :). (and that is not the css of course...)

EDIT: This is it probably?:

.hero-title {
    display: flex;
    font-family: 'Lato', sans-serif;
    font-weight: 900;
    font-size: 6em;
    color: #013243;
}

[eric-wieser]

Yeah, that looks like it - but it was 700 not 900 before anyway!

[mattip]

Merging. We can always tweak more if needed, but I think the idea of sticking to defaults is good.

[mattip]

Thanks @eric-wieser

[eric-wieser]

@bjnath, feel free to create a PR restoring some overrides, especially if they make things consistent with numpy.org