Publish v0.50.x documentation

[oleiade]

What?

This PR copies the latest state of the sources/next folder as sources/v0.50.x. It also addresses a bunch of eslint issues that kept me from committing the changes and somehow found their way to the upstream 🙇🏻

Checklist

• I have used a meaningful title for the PR.
• I have described the changes I've made in the "What?" section above.
• I have performed a self-review of my changes.
• I have run the npm start command locally and verified that the changes look good.
• I have made my changes in the docs/sources/next folder of the documentation.

Related PR(s)/Issue(s)

k6/#3577

[mstoykov]

Can you share the error you get that this is fixing?

[oleiade]

It addresses stuff like the following: https://github.com/grafana/k6-docs/pull/1533/files#diff-8c065fb2955bda9e9152922061225c2e47321ad1fd0229e2953087a6ae35685bR143

This file is full of them. I looked into the docs, and couldn't find any mention of window related to the browser module; that would explain where it comes from at least. Eslint complains this is unimported, so my "carpet bombing" solution was to essentially tell it to ignore it, I'm open to any alternative 👍🏻

[oleiade]

Because the PR is huge, GitHub struggles to open the link I pasted ☝🏻 on my side. Here's the current next folder version of the window usage I referred to:

k6-docs/docs/sources/next/using-k6-browser/metrics.md

Line 143 in 423ec4b

window.performance.measure('total-action-time', 'page-visit', 'action-completed')