Add alt text and description link to DataDriven sponsor placement (#153)

Hey! I'm the maintainer of [DataDriven](https://datadriven.io/) — thanks
for hosting our placement on the wiki, we appreciate it.

A handful of small improvements to the DataDriven placements:

**Index.md**
1. Adds `alt="DataDriven — Data Engineer Interview Practice"` to the
logo image — makes the placement accessible to screen-reader users.
2. Adds a short text link below the logo (`DataDriven — Free Data
Engineer Interview Problems`) so readers who don't load images still see
a brief description.
3. Adds a new wide lockup image (logo + wordmark + tagline) at
`Assets/logo-datadriven-wide.png`, rendered at `width=328` so it
preserves the existing on-page height.
4. Adds UTM parameters to both links so we can measure referral traffic
from each placement separately.
5. Adjusts the container `style` to `flex-direction: column` with a
small `gap` so the text link stacks cleanly below the logo (the existing
`flex-wrap: wrap` would put them side by side).

**README.md**
6. Adds `alt` text and UTM parameters to the existing README sponsor
link. Image source and dimensions are unchanged — the README keeps the
original logo.

Happy to tweak the wording or revert any individual piece if you'd
prefer something else — feel free to push edits directly to this branch
or just close and rewrite. No worries either way.

Thanks for keeping the wiki running!

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: datadriven-io

Assets/logo-datadriven-wide.png

@@ -28,10 +28,11 @@ Welcome! This is the official wiki built and maintained by the [[Community|data
 
 ## Gold Sponsors
 
-<div class="sponsors-gold" style="display: flex; flex-wrap: wrap;">
-	<a href="https://datadriven.io/">
-	    <img src="./Assets/logo-datadriven.png" width=250>
+<div class="sponsors-gold" style="display: flex; flex-direction: column; align-items: flex-start; gap: 8px;">
+	<a href="https://datadriven.io/?utm_source=dataengineering-wiki&utm_medium=referral&utm_campaign=gold-placement&utm_content=index-logo">
+	    <img src="./Assets/logo-datadriven-wide.png" width=328 alt="DataDriven — Data Engineer Interview Practice">
 	</a>
+	<a href="https://datadriven.io/?utm_source=dataengineering-wiki&utm_medium=referral&utm_campaign=gold-placement&utm_content=index-textlink">DataDriven — Free Data Engineer Interview Problems</a>
 </div>
 
 <iframe src="https://dataengineeringcommunity.substack.com/embed" width="100%" height="320" style="border:1px solid #EEE; background:white;" frameborder="0" scrolling="no"></iframe>

Index.md

@@ -39,8 +39,8 @@ The Data Engineering Wiki is an CC0-1.0-licensed open source project with its on
 <a href="https://greatexpectations.io/cloud/?utm_source=reddit&utm_medium=sponsored&utm_campaign=r-dataengineering&utm_content=cloud-signup">
     <img src="https://raw.githubusercontent.com/data-engineering-community/data-engineering-wiki/41d72633bf4c6fea9f1d073f590dfc7d331359b4/Assets/great-expectations-logo.svg" width=250>
 </a>
-<a href="https://datadriven.io/">
-    <img src="./Assets/logo-datadriven.png" width=250>
+<a href="https://datadriven.io/?utm_source=dataengineering-wiki&utm_medium=referral&utm_campaign=gold-placement&utm_content=readme-logo">
+    <img src="./Assets/logo-datadriven.png" width=250 alt="DataDriven — Data Engineer Interview Practice">
 </a>
 
 </div>