add travelperks's logo (#1246)

FYI: picked the black logo because the green one has rather low contrast
against our white background.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: hypha

src/content/sponsors/travelperk/display.png

@@ -0,0 +1,31 @@
+---
+name: TravelPerk
+url: https://grnh.se/e4647ad81us
+location: "Spain"
+description:
+  "TravelPerk is a travel-management company that provides companies with a
+  variety of travel- and expense-management services. A business travel platform
+  that gives businesses and travelers the freedom to meet colleagues, clients,
+  and partners in real life. The way they want to. Giving them the power to
+  create and curate the experiences that puts them and these relationships
+  first."
+socials:
+  linkedin: "https://www.linkedin.com/company/travelperk"
+  twitter: "https://twitter.com/travelperk"
+  github:
+  discord:
+  mastodon:
+  bluesky:
+  instagram: https://www.instagram.com/travelperk
+tier: Gold
+logo_padding: 20px 20px
+draft: true
+---
+
+## About TravelPerk
+
+TravelPerk is a travel-management company that provides companies with a variety
+of travel- and expense-management services. A business travel platform that
+gives businesses and travelers the freedom to meet colleagues, clients, and
+partners in real life. The way they want to. Giving them the power to create and
+curate the experiences that puts them and these relationships first.