RFR: 7929: Add release splash for 8.3 [v2]

[Marcus Hirt]

> What it says.

Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:

  Delete MANIFEST.MF
  
  Shouldn't be here.

-------------

Changes:
  - all: https://git.openjdk.org/jmc/pull/441/files
  - new: https://git.openjdk.org/jmc/pull/441/files/70c4c3f9..8c5aa11c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmc&pr=441&range=01
 - incr: https://webrevs.openjdk.org/?repo=jmc&pr=441&range=00-01

  Stats: 23 lines in 1 file changed: 0 ins; 23 del; 0 mod
  Patch: https://git.openjdk.org/jmc/pull/441.diff
  Fetch: git fetch https://git.openjdk.org/jmc pull/441/head:pull/441

PR: https://git.openjdk.org/jmc/pull/441