Improving English translations & standardizing styles for various pages

[michaeljolley]

Description

1. Improved clarity of wording for native English speakers of the following pages:

• hello devs
• overview intro
• compression tutorial
• cookies tutorial

In case it wasn't obvious with two PR's in two days, I'm working on the English docs overall to improve the clarity for native English speakers. As a part of this work, I'm also standardizing styles to follow documentation norms for OSS projects (i.e. consistent heading styles, sequentially ordered heading tags, etc.) Ideally, I'll add a style guide for future contributors and include GitHub PR templates. The layout of this PR is following the example in the CONTRIBUTING.md, but we can make this a better experience for contributors by including it by default as a template. I'll be adding issues for those tasks in the coming days if that's okay with you.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

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[rsaz]

Excellent observations. Thank you for your continued contribution to standardization of our doc. Keep it up with the good work. 👍🏻