chore(github): add GitHub Sponsors username to FUNDING.yml

.github/FUNDING.yml

@@ -1,6 +1,6 @@
 # These are the supported funding model platforms
 
-github: [] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+github: [remarkablemark] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
 patreon: remarkablemark # Replace with a single Patreon username
 open_collective: # Replace with a single Open Collective username
 ko_fi: remarkablemark # Replace with a single Ko-fi username