從所有 commit 中刪除特定檔案

remove a file from a git repository with:
```
git filter-branch --tree-filter 'rm  file'
```

remove a folder from a git repository with:
```
git filter-branch --tree-filter 'rm -rf directory'
```
This removes the directory or file from all the commits

you can specify a commit by using:
```
git filter-branch --tree-filter 'rm -rf directory' HEAD
```
Or an range
```
git filter-branch --tree-filter 'rm -rf vendor/gems' t49dse..HEAD
```
To push everything to remote, you can do:

```
git push origin master --force
```