<!--Delete sections as needed -->
## Description
I removed linebreaks in multi-stage-builds.md. These linebreaks rendered
awkwardly in my browser and aren't used in other areas of the page.
Firefox screenshot:
<img width="802" alt="Screenshot 2025-01-27 at 6 27 28 PM"
src="https://github.com/user-attachments/assets/ac729e1a-0a5f-440c-a92c-8e7579eee6d3"
/>
## Reviews
<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->
- [ ] Technical review
- [ ] Editorial review
- [ ] Product review
Updated the multi-stage-builds Docker concept page to include a
prerequisite for Java. Also updated the link and screenshot for the
Spring Initializer to the latest version.
The Dockerfile and Dockerfile.multi are created in later steps. The `springbootdocker` directory appears to be named `spring_boot_docker` in current download.
The build guide that I once wrote now duplicates a lot of content with
the concept guide launched a few months back. It doesn't make sense to
cover the same topics multiple times, so I'm removing the older build
guide and incorporating some of the topics into the build manual
instead.
Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>