add buttondown logo

[nicolaiarocci]

What does this PR change? What problem does it solve?

Add buttondown (https://buttondown.email) icon.

PR Checklist

• [x] I have verified that the code works as described/as intended.
• [x] This change adds a Social Icon which has a permissive license to use it.

[sonarcloud[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[zacharyc]

Should you add this to the documentation as well?

[nicolaiarocci]

@zacharyc you mean the wiki? To my knowledge GitHub doesn't support pull requests to the wiki repo. I already cloned and updated it locally, but I see no way to contribute it back.

[zacharyc]

@nicolaiarocci you are right, tried the same thing, sorry.

[nicolaiarocci]

@adityatelange I can do that. However, a few weeks ago I got in touch with the buttondown service author over email asking for permission, and he said that in his opinion the original logo appears too "bold" compared to the others:

He kindly offered to make a custom one for PaperMod, and his custom svg is the one submitted with this PR. If you still want to original, I will update the pull request of course.

[adityatelange]

@adityatelange I can do that. However, a few weeks ago I got in touch with the buttondown service author over email asking for permission, and he said that in his opinion the original logo appears too "bold" compared to the others:

He kindly offered to make a custom one for PaperMod, and his custom svg is the one submitted with this PR. If you still want to original, I will update the pull request of course.

I appreciate his efforts to make a custom one for PaperMod. If the owner prefers it this way sure, I will merge it.