RFR: 8313: 9.1.0 release splash

[Marcus Hirt]

Release splash for the 9.1.0 release.

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Commit messages:
 - 8313: 9.1.0 release splash

Changes: https://git.openjdk.org/jmc/pull/620/files
  Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=620&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8313
  Stats: 0 lines in 1 file changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jmc/pull/620.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/620/head:pull/620

PR: https://git.openjdk.org/jmc/pull/620