feat(www): Heading ids are hierarchical

[tivac]

Description

Make slug generation hierarchical based on heading ranks.

Motivation and Context

Allows for better, nicer visual presentation of the headings while still maintaining very meaningful and stable anchors.

How Has This Been Tested?

Ran site locally

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

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[netlify]

✔️ Deploy Preview for m-css ready!

🔨 Explore the source changes: 0f8ffd4

🔍 Inspect the deploy log: https://app.netlify.com/sites/m-css/deploys/6219201ba7659200074b6cd6

😎 Browse the preview: https://deploy-preview-814--m-css.netlify.app

[codecov]

Codecov Report

Merging #814 (0f8ffd4) into main (b76ded7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #814   +/-   ##
=======================================
  Coverage   99.56%   99.56%           
=======================================
  Files          34       34           
  Lines        1389     1389           
  Branches      227      227           
=======================================
  Hits         1383     1383           
  Misses          6        6           

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