USWDS-Site - Migration guide: Add note about autoprefixer

[mahoneycm]

Summary

Moved Autoprefixer note to an include and added the note to the Migrating to 3.0 page.

Warning
Ignored two snyk vulnerabilities causing test failures. This can be resolved by #2322

Warning resolved and can be ignored. Leaving for historical context.

Related issue

Closes #2296

Preview link

Migrating to 3.0 page →
Phase 2: Compile →

Changelog →

Note
Must update changelog date before merge

Problem statement

Issue arose from a discussion in the public slack channel. Some users may be using the migration guide exclusively to set up their builds. Without this important piece of information, these users may run into issues with their CSS.

Solution

Use note about Autoprefixer from Phase 2: Compile page in the Sass compiler instructions.

Testing and review

1. Inspect new autoprefixer-note.html does have gramattical errors.
2. Visit the Phase 2: Compile page
3. Confirm Autoprefixer note matches what's on develop.
4. Visit the Migrate to 3.0 page
5. Inspect new note re: Autoprefixer
6. Confirm placement is appropriate

[amyleadem]

This looks good to me! The content makes sense and was added to a logical location. I had just a couple notes:

I wonder if it makes sense to create an include for this content since it appears to be duplicate content from the Getting started for devs guide. It isn't clear what our pattern is on the site, but creating a shared include would ensure consistency and simplify editing if we ever wanted to change the content there. Curious what you think.

Also, can you resolve the merge conflicts?

[mahoneycm]

@amyleadem Good thinking! Changed pushed up and conflicts resolved!

[amyleadem]

Looks good to me!

• Confirmed that the site note on the compile page is unchanged
• Confirmed that the migration guide now has a note about autoprefixer
• Confirmed the note on the migration page is in a logical location
• Confirmed the note on the migration page has content that makes sense in context
• Confirmed the changelog is accurate and makes sense

[mejiaj]

LGTM, changelog date and preview link for phase-two needs to be updated. Good to merge after.

[mahoneycm]

@mejiaj I've updated the changelog date and phase-two link. Pa11y tests are failing in the pipeline but working passing!

[mahoneycm]

@thisisdano quick win PR ready for your review!