Remove unused markdown files copied from old STU3 IG

[robeastwood-agency]

With the transition from the old STU3 HL7AU repository to this R4 repository, a number of profile markdown files were copied across but can now be removed (in order to clean up the repository). None of the files are used in the generated R4 IG and can safely be removed.

They are markdown files (in the folder /pages/_includes) for these artefacts:

• associated-practitionerrole (extension)
• attester-related-party (extension)
• au-device (profile) - note that there may be future interest in such a profile
• au-endpoint (profile) - note that there may be future interest in such a profile
• au-immunizationrecommendation (profile)
• au-observation-age (profile)
• author-role (extension)
• base-composition-v1 (profile)
• category-additional (extension)
• composition-author-role (extension)
• encounter-destination-organisation (extension)
• encounter-origin-organisation (extension)
• healthcareservice-communication (extension)
• healthcareservice-eligibility-detail (extension)
• list-source-role (extension)
• medication-administration-witness (extension)
• medication-strength-text (extension)
• minimum-interval-between-repeats (extension)
• pbs-sponsor (profile)
• pbs-sponsor-organisation (profile)
• performer-party (extension)
• profile (early profiles file)
• recorder (extension)
• section-author (extension)
• shs-v1 (profile)

The files include "<id>-intro.md", "<id>-summary.md", "<id>-search.md" and "<id>-watermark.md".

[dtr-agency]

Not all of the above fall into that category - they aren't used now but they may be in future. There is need to clean up the underlying repository, including but not limited markdown files.

[dtr-agency]

Done.