fix(markdown): allow relative paths

[JulieMarie]

Description

Now markdown will work with both Absolute and Relative paths to allow for offline capabilities

What's included?

Accept Relative paths as well as Absolute paths

Test Steps

• [ ] npm run start
• [ ] then this
• [ ] finally this

General Tests for Every PR

• [ ] npm run start still works.
• [ ] npm run lint passes.
• [ ] npm run stylelint passes.
• [ ] npm test passes and code coverage is not lower.
• [ ] npm run build still works.

Screenshots or link to StackBlitz/Plunker

[owilliams320]

:tada: This PR is included in version 4.17.0 :tada:

The release is available on:

• v4.17.0
• GitHub release

Your semantic-release bot :package::rocket: