Delete Quiz.md

Using gist rather than this file.
Update 1_git_and_github.md
Update readme.md

made fourth challenge solo.
Update readme.md

fixed bold.
designated 4_Your_Own_Website as solo challenge
Merge branch 'editing_week_1'
designated 4_Your_Own_Website as solo challenge
deleted target=_blank from week readme
deleted target=_blank from week readme
removed all target=_blank
fixed merge conflicts
fixed link
fixed link formatting typo
Update readme.md

deleted "HEAD"
Update readme.md

deleted superfluous asterisk
added instructions and week outline
finished submission list
fixed link for third challenge
fixing checkboxes
deleted attempt to create checkbox