Replace GH pages for snapshot with OSSHR

[npetzall]

Currently we publish snapshots to github pages, which is a branch.

An option would be to link to OSSHR and the snapshot repository.

https://s01.oss.sonatype.org/service/local/artifact/maven/redirect?r=snapshots&g=org.schemaspy&a=schemaspy&c=app&v=LATEST&e=jar

The url will be not as nice, the "suggested" name wont be nice either schemaspy-7.0.0-20230818.001010-42-app.jar since we use timestamped snapshots, not sure if the configuration to disable timestamped version will work osshr.

But we would need to add uniqueVersion = false to distributionManagement for snapshots.

<snapshotRepository>
            <id>ossrh</id>
            <url>https://s01.oss.sonatype.org/content/repositories/snapshots</url>
            <uniqueVersion>false</uniqueVersion>
</snapshotRepository>