silky-letter-insa:0.2.3, silky-report-insa:0.5.3 and silky-slides-insa:0.2.0

[SkytAsul]

I am submitting

• a new package
• an update for a package

• Updated some assets
• Added multiple new options to the slides template
• Fixed issues

• ensured that my package is licensed such that users can use and distribute the contents of its template directory without restriction, after modifying them through normal use.

[saecki]

Thanks!

_{(Follow up to #5276)}