docs: change branding Pawkey (#1)

- Change string instances from Sharkey to Pawkey
- Change logos and art to Pawkey
- Change repository URL where possible to our git repo
- Puppy > Shonks
- Change repo in compose_example.yml

Co-Authored-By: Bluey Heeler <bluey@pawkey.dev>

packages/backend/src/server/api/endpoints/sponsors.ts

@@ -9,7 +9,7 @@ import { SponsorsService } from '@/core/SponsorsService.js';
 
 export const meta = {
 	tags: ['meta'],
-	description: 'Get Sharkey Sponsors or Instance Sponsors',
+	description: 'Get Pawkey Sponsors or Instance Sponsors',
 
 	requireCredential: false,
 	requireCredentialPrivateMode: false,