TEZ-4581: ASF matomo integration for web site analytics

[zabetak]

1. Use matomo for gathering usage statistics
2. Update the privacy policy link accordingly

[tez-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	13m 47s	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	14m 19s	master passed
+1 💚	mvnsite	0m 15s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 6s	the patch passed
+1 💚	markdownlint	0m 0s	The patch generated 0 new + 0 unchanged - 8 fixed = 0 total (was 8)
+1 💚	mvnsite	0m 5s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	xml	0m 1s	The patch has no ill-formed XML file.
		_ Other Tests _
+1 💚	asflicense	0m 20s	The patch does not generate ASF License warnings.
		29m 20s

Subsystem	Report/Notes
Docker	ClientAPI=1.47 ServerAPI=1.47 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-375/1/artifact/out/Dockerfile
GITHUB PR	#375
JIRA Issue	TEZ-4581
Optional Tests	dupname asflicense markdownlint mvnsite xml
uname	Linux 1a4efde6c459 5.15.0-117-generic #127-Ubuntu SMP Fri Jul 5 20:13:28 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/tez.sh
git revision	master / 607b2bc
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-375/1/console
versions	git=2.34.1 maven=3.6.3 markdownlint=0.23.2
Powered by	Apache Yetus 0.12.0 https://yetus.apache.org

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[abstractdog]

thanks @zabetak for this contribution!
I'm afraid the current site is out of sync with the xml files in the repo, hence I believe we might want to fix that first
in the meantime, maybe we can add this manually to tez.apache.org, but let me check the webpage's state before doing so