Fix core docs version switch (#982)

Author: fhammerschmidt

src/ApiDocs.res

@@ -180,11 +180,13 @@ module SidebarTree = {
             router->Next.Router.push(targetUrl)
           }
           let version = url->Url.getVersionString
-          let availableVersions = switch node.name {
-          | "Core" => [("latest", "v11.0.0")]
-          | _ => ApiLayout.allApiVersions
-          }
-          <VersionSelect onChange version availableVersions nextVersion=?Constants.nextVersion />
+
+          <VersionSelect
+            onChange
+            version
+            availableVersions=Constants.coreVersions
+            nextVersion=?Constants.nextVersion
+          />
         | None => React.null
         }}
       </div>

src/common/Constants.res

@@ -10,9 +10,11 @@ type versions = {
 
 @scope("process") external versions: versions = "env"
 
+let latestVersion = (versions.latest, versions.latest->Semver.tryGetMajorString)
+
 // This is used for the version dropdown in the manual layouts
 let allManualVersions = [
-  (versions.latest, versions.latest->Semver.tryGetMajorString),
+  latestVersion,
   ("v10.0.0", "v9.1 - v10.1"),
   ("v9.0.0", "v8.2 - v9.0"),
   ("v8.0.0", "v6.0 - v8.2"),
@@ -23,6 +25,8 @@ let nextVersion =
     ? None
     : Some(versions.next, versions.next->Semver.tryGetMajorString)
 
+let coreVersions = [latestVersion]
+
 let allReactVersions = [("latest", "v0.12.0"), ("v0.11.0", "v0.11.0"), ("v0.10.0", "v0.10.0")]
 
 let dropdownLabelNext = "--- Next ---"