feat(docs): update invoicer template page

[alicanerdurmaz]

PR Checklist

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• The commit message follows our guidelines: https://refine.dev/docs/guides-concepts/contributing/#commit-convention

Bugs / Features

• Related issue(s) linked
• Tests for the changes have been added
• Docs have been added / updated
• Changesets have been added https://refine.dev/docs/guides-concepts/contributing/#creating-a-changeset

What is the current behavior?

What is the new behavior?

invoice template description, links, and image is updated

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8a96cef

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[BatuhanW]

This is a test comment.

/deploy app-crm-minimal, invoicer

[BatuhanW]

/deploy app-crm-minimal, win95