refactor(sdk-android): publish under io.github.priyanshujain.sanderling + ci docs fix (#27)

* refactor(sdk-android): publish under io.github.priyanshujain.sanderling

Move the published Maven coordinates to a sanderling sub-namespace so the
brand is visible in the dependency line (was io.github.priyanshujain:sdk-android).
Sub-namespace is auto-allowed by Sonatype under the verified parent groupId.

* chore: update sdk-android coordinates in folio + docs

Follow the groupId change to io.github.priyanshujain.sanderling:sdk-android.

* ci(docs): use --version flag for d2 install script

The d2 installer accepts --version vX.Y.Z, not --tag. The --tag form
was rejected as "unrecognized flag" on the docs workflow run after
PR #26 merged.

examples/folio/composeApp/build.gradle.kts

@@ -83,7 +83,7 @@ kotlin {
         androidMain.dependencies {
             implementation("androidx.activity:activity-compose:1.13.0")
             implementation("app.cash.sqldelight:android-driver:$sqldelightVersion")
-            implementation("io.github.priyanshujain:sdk-android:$sanderlingVersion")
+            implementation("io.github.priyanshujain.sanderling:sdk-android:$sanderlingVersion")
         }
 
         iosMain.dependencies {