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Update readme.md

fixed typo from .js to .md as per Danielles suggestion
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Update readme.md
Update readme.md
updated link to intro lab
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Update readme.md
replaced bad file name causing broken links
add clarification to boggle steps
minor clarification
Merge pull request #61 from euwest/readme_updates

Readme updates
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removed lifehacker instructions for now, creating much confusion for students.
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Update readme.md
un-released week 2 and 3
limited exercise to one site
added parts on tracking time and reaching out
added different learning resources beyond GDI slides
added different learning resources beyond GDI slides