feat(linkedin): add Cloudways sponsor announcement

[Eomm]

Draft LinkedIn post announcing Cloudways as a new sponsor and the community offer (25% off for 3 months with code CWFASTIFY).

File: linkedin/4-cloudways-sponsor.md

Open to feedback on tone and on whether to keep the closing line about sponsorships funding maintenance.

[jean-michelet]

I may be missing something, but I don’t see any public record of the Cloudways sponsorship on Open Collective or GitHub Sponsors.

Could someone point me to where this sponsorship is recorded?

[Eomm]

Here:

• feat: add Cloudways as a tier-4 sponsor website#498

They are not using a "clear" name here in GH tho