If you want to delete all git commit history but keep the files, you can follow the steps bellow.

IMPORTANT: Please DO NOT delete the .git folder directly, as this will cause issues with your git repository.

1. Create an Orphan Branch 

git checkout --orphan new_branch

Create an orphan branch (a branch without a parent branch), named new_branch, and switch to it.

--orphan: Create an orphan branch from starting from the current HEAD. The first commit made on this new branch will establish a new history that is entirely disconnected from all other branches and commits.