Add explanation of git's name

[christopherphan]

If this pull request addresses an open issue on the repository, please add 'Closes #NN' below, where NN is the issue number.

Closes #890

Please briefly summarise the changes made in the pull request, and the reason(s) for making these changes.

Add a short paragraph to "The long history of version control systems" callout in 01-basics that discusses the name of git, pointing the reader to the git project's README for information.

If any relevant discussions have taken place elsewhere, please provide links to these.

Details

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[erinmgraham]

Hi Christopher, thank you for the PR! I like how you've kept most of the naming details in the README — that works well. I’m thinking we should briefly mention why Git was created and include one of Torvalds’ definitions to address the concerns raised in issue #809. For example, "Git was created by Linus Torvalds in 2005 as an open source alternative to BitKeeper, one of the first distributed version control systems, to track changes in the Linux kernel. Torvalds provided several explanations of the name, of varying degrees of politeness, which are enumerated in the
project's README, including “Global Information Tracker” for when you're in a good mood." What do you think?
I also note @martinosorb self-assigned this issue and may have other comments.

[christopherphan]

@erinmgraham thanks for the very kind and thoughtful response. I have incorporated these suggestions into an additional commit.

[erinmgraham]

Thanks Christopher!