style(icon): Update to new twitter logo

[venkyvajrala]

Fixes: #3633

[google-oss-prow]

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[google-oss-prow]

Hi @venkyvajrala. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[thesuperzapper]

@venkyvajrala why did you update docsy in this PR?

Also, updating docsy is way more complex than just updating the submodule.

[Arhell]

/ok-to-test

[venkyvajrala]

@thesuperzapper
it has dependency on docsy font-awesome package version. Twitter logo doesn't appear if we don't update the package version of font-awesome to 6.4.2 .I made the change in docsy repo and added the commit which has 6.4.2 package version for font-awesome library.
Please let me know if I am missing anything.