Broken local template link in emoji-emojione README

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Description:

apps/meteor/app/emoji-emojione/README.md contains a broken local markdown link on line 11.

The README links to emojione.sprites.mustache, but that file no longer exists in the repository.

Steps to reproduce:

1. Open apps/meteor/app/emoji-emojione/README.md.
2. Click the local link emojione.sprites.mustache.
3. Observe the target file is missing.

Expected behavior:

The link should point to the current local template used by the emoji sprite generator: lib/emojione.tpl.

Actual behavior:

The current link points to a deleted file and fails.

Server Setup Information:

• Version of Rocket.Chat Server: N/A (documentation issue)
• License Type: N/A
• Number of Users: N/A
• Operating System: N/A
• Deployment Method: N/A
• Number of Running Instances: N/A
• DB Replicaset Oplog: N/A
• NodeJS Version: N/A
• MongoDB Version: N/A

Client Setup Information

• Desktop App or Browser Version: Any
• Operating System: Any

Additional context

apps/meteor/app/emoji-emojione/lib/generateEmojiIndex.mjs currently references emojione.tpl, so the README should link to that file.

Relevant logs:

N/A