docs: add lumberjack 15 announcement to the blog

[NachoVazquez]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

The Lumberjack 15 announcement has not been added to the documentation website blog yet.

What is the new behavior?

The Lumberjack website contains the blog announcing the new version of Lumberjack: v15

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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