Update reference regex to not break on beta versions

[davepagurek]

Most appropriate sections of the p5.js website?

Reference

What is your operating system?

Mac OS

Web browser and version

Firefox

Actual Behavior

In the reference builder, we add a v to the start of the latest release if it seems to all be numeric:

p5.js-website/src/scripts/parsers/reference.ts

Lines 26 to 28 in df16dae

	if (/^\d+\.\d+\.\d+$/.exec(latestRelease)) {
	latestRelease = 'v' + latestRelease;
	}

This regex breaks for beta releases, e.g. 2.0.0-beta.5. We're about to release 2.0 so we won't have beta releases for a while, but we may want this working for the future when we do beta 3.0 releases.

Expected Behavior

The regex should match strings like 2.0.0-beta.5 too.

Steps to reproduce

Manually edit this

p5.js-website/src/globals/p5-version.ts

Line 1 in df16dae

export const p5Version = "v2.0.0-beta.8" as const;

to not start with a v

Would you like to work on the issue?

Feel free to take this on for me!