add python-institute's logo (#1405)

logo added, ready for review; in drafting stage, pending sponsor team's
greenlight for merge

---------

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

Author: hypha

src/content/sponsors/python-institute/index.md

@@ -0,0 +1,17 @@
+---
+name: OpenEDG PYTHON INSTITUTE
+url: https://pythoninstitute.org
+socials:
+  linkedin: "https://www.linkedin.com/company/pythoninstitute/"
+  twitter: "https://x.com/pythoninstitute"
+  youtube: "https://www.youtube.com/channel/UC2IRXg1rRD2yiig1Sqbf6iQ/"
+  instagram:
+  discord: "https://discord.gg/eJ2sW8SYgJ"
+description:
+  "Join the community of learners, creators, professionals, educators, and
+  world-changers. Learn, certify, make an impact. Expand your career
+  opportunities with the Python Institute's training and certification programs.
+  Program your future."
+tier: Patron
+logo_padding: 40px
+---