vimrc: fixes

* Use vimrc from dotfiles for quick edit.

* Two space indentation in plaintext.

* Remap write.

* Add txt extension to scrapbook.

* Do not allow deleting NERDTree buffer.

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>
gitconfig: alias fixes

* Make add all compliant to deletes/ renames.

* Drop i from commit aliases to avoid ci/ co typos.

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>