docs(ol-feature): add separate documentation for ol-feature

[d-koppenhagen]

closes #145

Description

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of Changes

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Other (Tooling, Dependency Updates, etc.)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

If you added a new component feature (layer, geom, source, etc.), please be sure to update the documentation:

• Create a src/demos/<Component>Demo.vue
• Create a docs/componentsguide/<Category>/<Feature>/index.md containing the Demo and documentation for the component
• Add the docs page to docs/.vitepress/config.ts
• Update the sitemap docs/public/sitemap.xml

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