Update settings to 2.48. Closes #63

Please review in particular such changes as my addition of web links for plugins or 3rd party tools mentioned in the settings, e.g. the link for Stash. I don't know if it's welcomed or inappropriate to have such links.
This is not related to your change, but as you are a native English speaker, I see no clear difference between 'in a file called .gitconfig' and  'in the .git\config' in a matter of using  'a' vs 'the'. Are these sentences correct?