UX: add "Next Page" link to the bottom of each Handbook section based on ToC order

[theronic]

I was trying to read through the Basecamp Handbook, but there was no "Next Page" link and the order on GitHub is alphabetical instead of the order in the Table of Contents, so I added a small link at the bottom of each page that links to the next page, based on the intended order in the README.md. Avoids a click / browser nav back to ToC and a "where was I again?" feeling.

Before:

After:

Use it, don't use it 🤷🏻‍♂️

[claude]

Claude Code Review

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[Copilot]

Pull request overview

Adds sequential navigation matching the README’s handbook order.

Changes:

• Adds “Continue to…” links across all non-final sections.
• Uses branch-safe relative Markdown links.

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Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
getting-started.md	Links to Benefits & Perks.
benefits-and-perks.md	Links to How We Work.
how-we-work.md	Links to Making a Career.
making-a-career.md	Links to Our Rituals.
our-rituals.md	Links to Managing Work Devices.
managing-work-devices.md	Links to Our Internal Systems.
our-internal-systems.md	Links to Moonlighting.
moonlighting.md	Links to State Leave Provisions.
stateFMLA.md	Links to Severance Packages.
severance.md	Links to Titles for Designers.
titles-for-designers.md	Links to Titles for Ops.
titles-for-ops.md	Links to Titles for Programmers.
titles-for-programmers.md	Links to Titles for QA.
titles-for-QA.md	Links to Titles for Support.

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