Fixes #9358 - Add article about using light themes

[sdwheeler]

PR Summary

Fixes AB#50800 - Fixes #9358 - Add article about using light themes

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[opbld31]

Learn Build status updates of commit a16527c:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/learn/shell/using-light-theme.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/toc.yml	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[SteveL-MSFT]

Overall looks good to me

[theJasonHelmick]

This looks good -- thank you for putting this together.

[StevenBucher98]

LGMT, later down the line we should include an example accessible theme that fits the ratio described at the bottom

[michaeltlombardi]

Overall, LGTM - just a couple nits and non-blocking suggestions.

[opbld33]

Learn Build status updates of commit aa64f4f:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/learn/shell/using-light-theme.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/toc.yml	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[opbld30]

Learn Build status updates of commit bde7e1f:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/learn/shell/using-light-theme.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/toc.yml	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

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