quick-start-guide: fix broken URL

[hades]

Replace a relative directory path with an absolute URL to Github, so that the readthedocs site[1] renders it correctly.

[1] https://mgmt.readthedocs.io/en/stable/quick-start-guide.html#examples

Tips:

• please read the style guide before submitting your patch: docs/style-guide.md

• commit message titles must be in the form:

topic: Capitalized message with no trailing period

or:

topic, topic2: Capitalized message with no trailing period

• golang code must be formatted according to the standard, please run:

make gofmt		# formats the entire project correctly

or format a single golang file correctly:

gofmt -w yourcode.go

• please rebase your patch against current git master:

git checkout master
git pull origin master
git checkout your-feature
git rebase master
git push your-remote your-feature
hub pull-request	# or submit with the github web ui

• after a patch review, please ping @purpleidea so we know to re-review:

# make changes based on reviews...
git add -p		# add new changes
git commit --amend	# combine with existing commit
git push your-remote your-feature -f
# now ping @purpleidea in the github PR since it doesn't notify us automatically

Thanks for contributing to mgmt and welcome to the team!

[purpleidea]

Oh interesting! Actually the bigger issue is the read the docs site is totally stale. Not sure how that was setup and if it's even useful anymore...

[purpleidea]

Thank you! I tried to push the latest version of the docs with the newest sphinx, but it didn't work. I think we'll probably deprecate this, but for now I'll leave this in case sphinx or future tools work correctly.