add g-research's logo (#1397)

Waiting for sponsor team's go-ahead before merging.

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

Author: hypha

src/content/sponsors/g-research/g-research.svg

@@ -0,0 +1,20 @@
+---
+name: "G-Research"
+url: "https://www.gresearch.com/"
+description:
+  "We are a leading quantitative research and technology firm. We hire the
+  brightest minds to tackle the biggest questions in finance. We pair our
+  people’s expertise with machine learning, big data, and emerging tech to
+  predict movements in financial markets."
+socials:
+  linkedin: "https://www.linkedin.com/company/g-research/"
+  twitter:
+  github:
+  discord:
+  mastodon:
+  bluesky:
+  youtube: "https://www.youtube.com/@GResearchquantfinance"
+  instagram: "https://www.instagram.com/gresearchcareers/"
+tier: Gold
+logo_padding: 10px
+---