TEZ-4525: Remove broken links from site

[akshat0395]

The links under Presentations and Talks on Tez section for User meetup recrodings is broken.

Link for recording: https://hortonworks.webex.com/hortonworks/ldr.php?AT=pb&SP=MC&rID=125516477&rKey=d147a3c924b64496

as well as meetup group link: http://www.meetup.com/Apache-Tez-User-Group/events/130852782/ doesn't exist anymore.

[tez-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	24m 8s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ master Compile Tests _
+1 💚	mvninstall	20m 19s	master passed
+1 💚	mvnsite	0m 23s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 8s	the patch passed
+1 💚	markdownlint	0m 2s	The patch generated 0 new + 9 unchanged - 1 fixed = 9 total (was 10)
+1 💚	mvnsite	0m 8s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
		_ Other Tests _
+1 💚	asflicense	0m 21s	The patch does not generate ASF License warnings.
		46m 7s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-322/1/artifact/out/Dockerfile
GITHUB PR	#322
JIRA Issue	TEZ-4525
Optional Tests	dupname asflicense markdownlint mvnsite
uname	Linux 9ecfc47ddd17 5.15.0-88-generic #98-Ubuntu SMP Mon Oct 2 15:18:56 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/tez.sh
git revision	master / 0c5cf68
Max. process+thread count	77 (vs. ulimit of 5500)
modules	C: docs U: docs
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-322/1/console
versions	git=2.34.1 maven=3.6.3 markdownlint=0.23.2
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