Do not set defaults for python-mode

Keep the standards as they are and customize the variables when necessary.
Changing the defaults almost always causes trouble when running on other
machines.  For example, `python3` is the name of the Linux executable, but not
the Windows one.

init.el

@@ -2939,8 +2939,6 @@ With given ARG, display files in `db/important-document-path’."
   :commands (pdf-tools-install))
 
 (use-package python
-  :init (setq python-indent-offset 2
-              python-shell-interpreter "python3")
   :config (progn
             (add-hook 'python-mode-hook #'highlight-indentation-mode)
             (add-hook 'python-mode-hook #'company-mode)