Remove the example block in it's entirety

[dekode-kevin]

Short introduction

Remove the example block in the theme in it's entirety.

Description

We don't recommend adding the blocks in the theme folder, so it doesn't make sense for it being there. We also generally suggest using the scripts for creating blocks. Added some documetation about using the package.json script to create new blocks.
Scripts:

project-base/package.json

Lines 40 to 41 in 4691281

	"create-block": "cd packages/plugins && npx dekodeinteraktiv/create-project-base-block",
	"create-innerblock-block": "cd packages/plugins && npx dekodeinteraktiv/create-project-base-block --template innerblocks",

[luistinygod]

I totally agree with removing custom blocks from theme package.