_content/solutions: rename twitter case study to X

Fixes golang/go#72899

Change-Id: Iab662de48d15bd85e7fe85db7c2fe1b2bc2080a8
Reviewed-on: https://go-review.googlesource.com/c/website/+/658575
Reviewed-by: Ian Lance Taylor <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: ianlancetaylor

_content/images/logos/twitter.svg

@@ -1,10 +1,10 @@
 ---
-title: "Twitter - 5 billion sessions a day in realtime"
+title: "X - 5 billion sessions a day in realtime"
 description: "We now see about five billion sessions per day, and growing. Hundreds of millions of devices send millions of events every second to the Answers endpoint. During the time that it took you to read to here, the Answers back-end will have received and processed about 10,000,000 analytics events."
-company: Twitter
-logoSrc: twitter.svg
-logoSrcDark: twitter.svg
+company: X
+logoSrc: x.png
+logoSrcDark: x.png
 series: Case Studies
-link: https://blog.twitter.com/engineering/en_us/a/2015/handling-five-billion-sessions-a-day-in-real-time.html
+link: https://blog.x.com/engineering/en_us/a/2015/handling-five-billion-sessions-a-day-in-real-time.html
 inLandingPageGrid: true
 ---