fix(#288): use web-components for OMBInfo and move IntroductionPage

[bjmccotter7192]

Description

In this PR, I have removed the OMBInfo placeholder component and replaced it with the DST web-component VaOmbInfo.

Also removed the IntroductionPage component since we probably shouldn't export/expose a burial introduction compared to just writing your own IntroductionPage per application.

Original issue(s)

department-of-veterans-affairs/va-forms-system-core#288

Testing done

• [x] All Unit Test Passed
• [x] OMB Info is showing up on new IntroductionPage

Screenshots

Definition of done

• [x] Package.json version has been updated to match Github release tag
• [x] Documentation has been updated, if applicable
• [x] A link to the original github issue has been provided
• [x] No sensitive information (i.e. PII/credentials/internal URLs etc.) is captured in logging, hardcoded, or specs

[va-vsp-bot]

:tada: This PR is included in version 1.4.3 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: