README: Twitter/X follow badge is broken (badgen.net)

[kalwalt]

Summary

The Twitter/X follow badge in README.md is broken and doesn't render.

Environment

• Product/Service: README.md badges (badgen.net)
• File: README.md line 8

Reproduction Steps

1. Open README.md on GitHub (or any Markdown renderer)
2. Look at the badge row at the top

Expected Behavior

A working "Follow @WebarkitO" badge, consistent with the other badges (npm version, CI, github stars, etc.) which all render correctly.

Actual Behavior

![twitter](https://flat.badgen.net/twitter/follow/WebarkitO)

renders as a broken/empty badge. badgen.net's Twitter integration has been broken for most users since the Twitter/X API lockdown — this is a widely reported issue, not specific to this repo.

Fix

Replace with the shields.io equivalent, which still works:

![X (formerly Twitter) Follow](https://img.shields.io/twitter/follow/:WebarkitO)

Impact

Low — cosmetic only, no functional impact, but it's one of the first things visible at the top of the README.

Additional Context

Found during the README overhaul in #77 — not fixed there since it was reported afterward.