Two asterisks enhancement

[joaocastro]

Description

Fixes problem with doubling asterisks on markdown editor. Since some user may want to still have this feature, we have implemented an option on Boostnote' settings to enable/disable it.

Issue fixed

#2218

Type of changes

• ⚪ Bug fix (Change that fixed an issue)
• ⚪ Breaking change (Change that can cause existing functionality to change)
• 🔘 Improvement (Change that improves the code. Maybe performance or development improvement)
• 🔘 Feature (Change that adds new functionality)
• ⚪ Documentation change (Change that modifies documentation. Maybe typo fixes)

Checklist:

• 🔘 My code follows the project code style
• ⚪ I have written test for my code and it has been tested
• 🔘 All existing tests have been passed
• ⚪ I have attached a screenshot/video to visualize my change if possible

[joaocastro]

There was a problem with the merge commit, I'll fix it!

[ZeroX-DG]

Thank you for your contribution but I think your PR is duplicated with this PR: #2689