UXCore API fixes: add hy language + replace :ID with slug in API examples

[MaryWylde]

The UX Core API docs contain outdated or inconsistent examples. Update the static content on the UXCore API page.

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Main Requirements:

• Add Armenian language (hy) to the supported languages list
• Replace :ID with slug in all relevant endpoints and examples

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Languages list update
Current docs mention

Versions: ru, en

Should be

Versions: ru, en, hy

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UX Core bias endpoints: Use slug instead of :ID

Current

https://api.keepsimple.io/uxcore/:ID
Example: https://api.keepsimple.io/uxcore/:ID?lang=ru

Should be

https://api.keepsimple.io/uxcore/:slug
Example: https://api.keepsimple.io/uxcore/slug?lang=ru

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Fix example: get single bias by slug

Current example

GET https://api.keepsimple.io/uxcore/6?field=[link]

Should be

GET https://api.keepsimple.io/uxcore/6-cue-dependent-forgetting?field=[link]

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UXCG endpoints: use slug instead of :ID
The following endpoints should all reference slug, not numeric ID:

Current

https://api.keepsimple.io/uxcg/:ID
https://api.keepsimple.io/uxcg/:ID?lang=ru
https://api.keepsimple.io/uxcg/:ID?answers=7

Should be

https://api.keepsimple.io/uxcg/:slug
https://api.keepsimple.io/uxcg/slug?lang=ru
https://api.keepsimple.io/uxcg/slug?answers=7

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Fix example: get single UXCG question by slug
Current example
GET https://api.keepsimple.io/uxcg/15?lang=en&answers=0&related_questions=2

Should be
GET https://api.keepsimple.io/uxcg/users-call-our-product-boring?lang=en&answers=0&related_questions=2