Checks: run broken link checks per pr

[kollegian]

What is the purpose of the change?

Run checking links action per pr

Describe the changes to the documentation

None

Notes

[alexander-sei]

This can't work because the checkLinks.ts is always pointing to docs.sei.io so it actually never checks the links inside of the PR itself:

	const baseUrl = 'https://www.docs.sei.io/';
	await crawlPages(baseUrl, browserInstance, 'main');

	fs.writeFileSync('brokenLinks.json', JSON.stringify([...brokenLinks], null, 2));

[alexander-sei]

Doesn't work on the PR itself

[kollegian]

Doesn't work on the PR itself

You are most certainly right.