Add open-graph tags support

[jchapuis]

No description provided.

[mkurz]

@jchapuis Can you please rebase to solve conflicts? Thanks!

[jchapuis]

@mkurz sure! done

[mdedetrich]

@jchapuis You need to format the codebase

[jchapuis]

@jchapuis You need to format the codebase

yes i saw it was build.sbt i believe, pushed a commit

[mdedetrich]

I think one of the URI's need to be updated

[mdedetrich]

lgtm. @mkurz Want to take a look?

[mkurz]

Not sure if we should use project name as og:title.
Shouldn't we use something like here instead?

sbt-paradox-material-theme/theme/src/main/assets/page.st

Lines 48 to 54 in 4b214d8

	$ if (page.properties.("title")) $
	<title>$page.properties.("title")$</title>
	$ elseif (page.title) $
	<title>$page.title$$ if (!page.home.active) $ · $page.home.title$$ endif $</title>
	$ else $
	<title>$page.home.title$</title>
	$ endif $

[Roiocam]

I think those were metadata of open graph

[mkurz]

@Roiocam I understand that, however my point is if it makes sense to use the "project name" as og:title. Maybe it would be better to use the same value like we use for the html <title> tag.

[Roiocam]

Got it, makes sense. Thanks

[jchapuis]

good point, changed, but i kept the condition logic simple, where you have to define the page title property for it to be exposed in opengraph. Or would we want to have the same logic? trying to avoid unnecessary duplication

[Roiocam]

LGTM, Thanks @jchapuis. It would be great to get reviews from others.

[Roiocam]

I think those were metadata of open graph

[mkurz]

/cc @mdedetrich maybe you can also take a look here if you have time