Documentation Site - Add/Update guidance for using css-library on non vets-website projects

[powellkerry]

Description

The guidance for installing (src/_about/developers/install.md) needs to be updated. The current documentation refers to installing formation in projects, we need to develop and replace this guidance with how to use CSS Library in projects. This documentation is referring to projects outside of va.gov/vets-website.

Tasks

• Research how to use CSS Library outside of vets-website
• Write guidance and re-write src/_about/developers/install.md to reflect findings
• Remove the dont-use-deprecated status and intro-text

Acceptance Criteria

• Updated documentation is readable, understandable and works

[caw310]

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