docs: Document jsDelivr mirror for release-calendar.json

README.md

@@ -30,7 +30,7 @@ The reference pages under `docs.overturemaps.org/schema` are generated from the
 
 ## Release Calendar
 
-Release dates are published as JSON at `https://docs.overturemaps.org/release-calendar.json`, with a JSON Schema alongside it at `release-calendar.schema.json` (referenced by the file's `$schema` key, so editors validate edits as you type). `releases` is a flat list, and each entry has:
+Release dates are published as JSON at `https://docs.overturemaps.org/release-calendar.json`. A jsDelivr CDN mirror of the same file is at `https://cdn.jsdelivr.net/gh/OvertureMaps/docs@main/static/release-calendar.json`. A JSON Schema sits alongside the file at `release-calendar.schema.json` (referenced by the file's `$schema` key, so editors validate edits as you type). `releases` is a flat list, and each entry has:
 
 - `date`: release date, ISO 8601
 - `dataVersion`: the release's data version

docs/release-calendar.mdx

@@ -19,7 +19,7 @@ Release notes for the current release, including any patches:
 
 ## Proposed release schedule
 
-Our proposed release schedule is below. Release dates and schema versions are subject to change. The schedule is also available as JSON at [`/release-calendar.json`](https://docs.overturemaps.org/release-calendar.json).
+Our proposed release schedule is below. Release dates and schema versions are subject to change. The schedule is also available as JSON at [`/release-calendar.json`](https://docs.overturemaps.org/release-calendar.json), with a CDN mirror at [`cdn.jsdelivr.net/gh/OvertureMaps/docs@main/static/release-calendar.json`](https://cdn.jsdelivr.net/gh/OvertureMaps/docs@main/static/release-calendar.json) as a fallback.
 
 <ReleaseSchedule />
 
@@ -59,4 +59,4 @@ Overture has been releasing data monthly since October 2023. Past releases are l
 
 ## Release data as JSON
 
-The schedule and history above are also published as JSON at [`https://docs.overturemaps.org/release-calendar.json`](https://docs.overturemaps.org/release-calendar.json), for scripts and pipelines that need the next release date without scraping this page. The file's shape is described by its [JSON Schema](https://docs.overturemaps.org/release-calendar.schema.json). To find out which releases have shipped, use the [STAC catalog](https://stac.overturemaps.org/) instead.
+The schedule and history above are also published as JSON at [`https://docs.overturemaps.org/release-calendar.json`](https://docs.overturemaps.org/release-calendar.json), for scripts and pipelines that need the next release date without scraping this page. The same file is mirrored on the jsDelivr CDN at [`cdn.jsdelivr.net/gh/OvertureMaps/docs@main/static/release-calendar.json`](https://cdn.jsdelivr.net/gh/OvertureMaps/docs@main/static/release-calendar.json). The file's shape is described by its [JSON Schema](https://docs.overturemaps.org/release-calendar.schema.json). To find out which releases have shipped, use the [STAC catalog](https://stac.overturemaps.org/) instead.