Bump @sideway/formula from 3.0.0 to 3.0.1 in /developer-docs-site

Bumps [@sideway/formula](https://github.com/sideway/formula) from 3.0.0 to 3.0.1.
- [Commits](hapijs/formula@v3.0.0...v3.0.1)

---
updated-dependencies:
- dependency-name: "@sideway/formula"
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>