Fix double linking

We were linking to the shakesville site with both the link text 'resources' and the link text 'online'. This commit combines the two texts.
Merge pull request #20 from chrislo/patch-1

Fix double linking
Try a more explicit list of don'ts

This is a re-working of @timcowlishaw's suggestion.
Restructure harassment paragraphs a bit
Merge pull request #17 from lrug/be-more-explicit

Be more explicit in Incident Handling section
Add note about projector resolution
Temporary style overrides to improve appearance on phones
make sure links to external resources are separated by more than just whitespace
Merge pull request #24 from timcowlishaw/fix-links-with-whitespace-separators

make sure links to external resources are separated by more than just whitespace
Don't duplicate #content

We use #content for the main wrapper div and as the title of a section, and so the ToC links took you to the wrong place.  The quick fix is to use a thesaurus and replace the "Content" heading with "Subject Matter".  Revisit when we come up with nicer css.