Add ToC filter

[iansk]

Resurrect the ToC filter control in the sidenav (with fixes and tweaks).

Test URLs:

• Before: https://main--prisma-cloud-docs-website--hlxsites.hlx.page/
• After: https://ian-filter-nav--prisma-cloud-docs-website--hlxsites.hlx.page/

[aem-code-sync[bot]]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed. In case there are problems, just click a checkbox below to rerun the respective action.

• [ ] Re-run PSI checks
• [ ] Re-sync branch

Commits

* [fe79bd8](https://github.com/hlxsites/prisma-cloud-docs-website/commit/fe79bd87518d8811310db16522054c0eb40b6973) :white_check_mark: (latest) * [a282ec1](https://github.com/hlxsites/prisma-cloud-docs-website/commit/a282ec18fd4e4f8a07799082a8b7761b188ed7f9) :white_check_mark: * [14f4050](https://github.com/hlxsites/prisma-cloud-docs-website/commit/14f40502e331f6bdbf6a80d42acc150432322332) :white_check_mark: * [9903c88](https://github.com/hlxsites/prisma-cloud-docs-website/commit/9903c881908ce1a24adebf4dd29015a07936f620) :white_check_mark: * [194b69e](https://github.com/hlxsites/prisma-cloud-docs-website/commit/194b69e353b6a4ff1d66f2186275b82bf6326b3f) :white_check_mark: * [07f65bf](https://github.com/hlxsites/prisma-cloud-docs-website/commit/07f65bfd4d8aebfa836ab5c3093964fce9bcb891) :white_check_mark: * [bb136bc](https://github.com/hlxsites/prisma-cloud-docs-website/commit/bb136bcbd89209c42c1f30ca0fdb72956821f082) :white_check_mark: * [2e1a148](https://github.com/hlxsites/prisma-cloud-docs-website/commit/2e1a148664111b1f45648d111f7d518f04c7492f) :white_check_mark:

[aem-code-sync[bot]]

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[iansk]

@maxakuru Can you please review my PR? Thanks!

[iansk]

@maxakuru Thanks for your review. Merging this now.