[BUG] Anchor tags in the cookbook are without proper accessible naming

[Fuzzy3]

• I have written a good issue

Describe the bug

Currently most links (anchor tags) in the cookbook are not self-explaining - which is not a problem since they occur in a context that give them meaning. However when using a screen reader the user often traverses from link to link or even gets a complete overview of all the links shown without their surrounding context. This provides a poor experience for people using a screen reader.
This may easily be fixed by adding an aria-label to the anchor tags in the cookbook following the accessible naming convention.

Describe how to reproduce the bug

1. Go to any page in the cookbook - could be the accessibility page: cookbook.kirby.design/#/home/accessibility-in-kirby
2. Turn on voiceover and make it show the links overview
   Result: The links are shown but most without proper context to understand where they will take the user.

What was the expected behavior?

Each link should have an accessible name as described in the link - such that the intent of the link is clearly stated for people with disabilities.

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Checklist:

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Verification

To make sure the bug is not intended behaviour; it should be verified by a member of team Kirby before moving on to implementation.

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Implementation

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• Signal to others you are working on the issue by assigning yourself.
• Create a branch from the develop branch following our branch naming convention.
• Create a test that reproduces the bug following guidelines in: "The good: Test".
• Write code to fix the bug

Review

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