feat: Fleet Initial Theme Definition

[ennerperez]

No description provided.

[LegoYoda112]

Woah thanks for a full theme addition! I'll add you as a maintainer on the repo to let you merge this into the dev branch and verify the build system works.

I'll need to think through the deployment process a bit if we're going to add more apps to this; the two ways I can think of doing it for now are:

• having a branch for each deployment so we can separate when they run, or,
• have some logic on the main branch that only runs the deployments for themes that have their version incremented (e.g. vsce, the vscode tool, only uploads the package if the source version has been incremented relative to the published version and throws an error otherwise, a bit hacky to rely on, but it would work).

I'm somewhat new to CD systems to any advice is appreciated!