Add rel="me" to footer links for web sign-in

[infotexture]

✨ This is an enhancement or feature that builds on the microformat contributions by @dltj in #3052.

Adding rel="me" to footer links enables web sign-in or RelMeAuth, so you can use your domain to sign in to other sites.

In #3052, the rel="me" attributes were added to the author profile, but that only appears in post sidebars, and web sign-in requires these profile links to be present on the home page.

Adding this to the footer links ensures that these values are correctly detected by systems that check for the presence of bidirectional links between the author's home page and other profiles.

✅ Tested with the Web Sign In test at https://indiewebify.me.

[dltj]

I'm curious — does the rel="me" in the footer operate differently than the one that is in the author-profile.html

[infotexture]

I'm curious — does the rel="me" in the footer operate differently than the one that is in the author-profile.html

No, but as described above,

that only appears in post sidebars, and web sign-in requires these profile links to be present on the home page.

Services that support web sign-in only check the domain root for rel="me" links, so the auth process only works if they're found on the home page. Those services won't notice rel="me" links on other pages of the site.

[dltj]

Ah, I think I see...a critical difference between your site and mine is that you have overridden the homepage template so the author-profile.html file isn't included. Makes sense. This is a good change.

[iBug]

I don't think it would make sense to unconditionally add rel="me" to every footer link. Perhaps an option for each link item would be better.

(Contrary to Michael, I'm neutral to adding more config options as they're a requisite of flexibility.)