CDM v5.5 CRAN release

CRAN release

This release is to support the movement of CDM v5.5 to CRAN. There are no changes to the data model itself, just small fixes related to CRAN updates.

What's Changed

• fix rendering section headers in specification by @MaximMoinat in #808
• Fix Episodes anchor case in OncologyWG links by @asharaali in #810
• Release prep v1.1.0 by @anthonysena in #815
• Merge develop into main to support CRAN release by @clairblacketer in #816

New Contributors

• @asharaali made their first contribution in #810