[Feature] Add option to disable "Add new transaction"

[soloam]

Verified feature request does not already exist?

• I have searched and found no existing issue

💻

• Would you like to implement this feature?

Pitch: what problem are you trying to solve?

My actual is 100% sync with my bank, so the option to add a new transaction is usseless and would do more harm that good.

Describe your ideal solution to this problem

A option that would disable the add new transaction, this would remove the button

Teaching and learning

We would add a button to the settings, and would descrive the actual function "Disable add new transaction button"

[github-actions]

✨ Thanks for sharing your idea! ✨

This repository uses lodash style issue management for enhancements. That means enhancement issues are automatically closed. This doesn’t mean we don’t accept feature requests, though! We will consider implementing ones that receive many upvotes, and we welcome contributions for any feature requests marked as needing votes (just post a comment first so we can help you make a successful contribution).

The enhancement backlog can be found here: https://github.com/actualbudget/actual/issues?q=label%3A%22needs+votes%22+sort%3Areactions-%2B1-desc+

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