A11y: remove some ambiguous links

[louismaximepiton]

Description

Remove Examples titles in order to be consistent in the whole doc + remove ambiguous links between the header and the ToC (search and replace # Examples to # Example).

Motivation & Context

Remove rectifiable issues raised by aXe devtools in the browser over the Boosted doc.

Types of change

• Bug fix (non-breaking which fixes an issues)

Live previews

• https://deploy-preview-1676--boosted.netlify.app/

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0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[louismaximepiton]

Following gohugoio/hugo#10507, it seems like this isn't needed anymore since most of our links are inside a structure <ul><li></li></ul>. Furthermore it seems like the links with the same label aren't spotted anymore by aXeDevtools.