Update references from Twitter to X in overview section.

[SarthakPaandey]

This pull request includes updates to reflect the rebranding of Twitter to X across various files. The changes primarily involve updating references to Twitter in both the HTML and XML files.

[CLAassistant]

All committers have signed the CLA.

[SarthakPaandey]

@michaeloffner @zspitzer this was just a small first step. I'm looking forward to contributing much more in the future! Kindly merge it to boost my confidence. Thanks!