[feat] set default backticks option to false

[givvemee]

Closes #61

Description

• YOCO.useBacktick wrapping code blocks with backticks was set as true by default. It's not intended initially so that convert it to false to be default.

ETC

Checklist (Merge should only be performed once all of the following conditions are checked.)

• I have completed the necessary tests and verified that the functionality works as intended.
• I have written the code according to the code style guide.
• I have confirmed that only the intended files and changes have been committed.
• I have discussed these changes with my team members in advance, and all team members are aware of this PR.