feat: add doFollow parameter for contributor links

[anshgoyalevil]

This PR adds a new doFollow parameter that allows collectives to opt-in to
"dofollow" links in their contributor widgets. When enabled, the "nofollow"
attribute is removed from contributor links while maintaining the "sponsored"
attribute for proper link attribution.

Changes:

• Added doFollow parameter parsing in banner.js
• Modified link generation in svg-banner.js

The default behavior (nofollow links) remains unchanged unless explicitly
opted into using the doFollow parameter.

Fixes opencollective/opencollective#5968

[DreadKnight]

@anshgoyalevil Pretty good stuff from what I can tell! Seems from tests that it fails at linting.
Also, the parameter should be listed (documented) in the dashboard table here (ideally) -> https://opencollective.com/dashboard/ancientbeast/export

[anshgoyalevil]

Lint check is passing locally. Here in this PR, GHA won't trigger unless one of the maintainers runs it.

Would have to look around that dashboard table thing. I am not able to view that page on OpenCollective.com as it is only for admins. I might have to clone the OpenCollective frontend locally to view that

[anshgoyalevil]

Is this the place you are talking about, @DreadKnight?

As I can see, the parameters you are talking about won't be added to this page as they are exclusively for json API.

After this PR gets merged, that's how you can ask for a doFollow banner: https://opencollective.com/ancientbeast/tiers/sponsor.svg?avatarHeight=123&width=890&button=false&doFollow=true

Notice a doFollow=true at the end.

[DreadKnight]

Is this the place you are talking about, @DreadKnight?

As I can see, the parameters you are talking about won't be added to this page as they are exclusively for json API.

After this PR gets merged, that's how you can ask for a doFollow banner: https://opencollective.com/ancientbeast/tiers/sponsor.svg?avatarHeight=123&width=890&button=false&doFollow=true

Notice a doFollow=true at the end.

@anshgoyalevil Figured the parameter stuff 👍🏻 I'm talking about this table though (parameters for the widget):

[DreadKnight]

Lint check is passing locally. Here in this PR, GHA won't trigger unless one of the maintainers runs it.

Would have to look around that dashboard table thing. I am not able to view that page on OpenCollective.com as it is only for admins. I might have to clone the OpenCollective frontend locally to view that

Yeah, makes sense; can supposedly save some server resources 🐻

[Betree]

Can you add screenshots of the results after fixing the issue?

[Betree]

Missing quotes.

Suggested change

	)}" class="opencollective-svg" target="_blank" rel=${doFollow ? 'sponsored' : 'nofollow sponsored'} id="${
	)}" class="opencollective-svg" target="_blank" rel="${doFollow ? 'sponsored' : 'nofollow sponsored'}" id="${

=>

Please make sure to test your changes, the instructions to start the project are in the README.