Update the menus, add the browser pages, re-organize site navigation

i2p2www/browser.py

i2p2www/pages/downloads/list.html

i2p2www/pages/downloads/macros

i2p2www/pages/global/footer.html

i2p2www/pages/global/nav.html

i2p2www/pages/site/about/glossary.html

i2p2www/pages/site/browser/_front.html

i2p2www/pages/site/browser/download.html

i2p2www/pages/site/browser/intro.html

i2p2www/pages/site/browser/known_issues.html

i2p2www/pages/site/browser/troubleshooting.html

i2p2www/pages/site/contact.html

i2p2www/static/images/browser/garlic.svg

i2p2www/static/styles/duck/default.css

i2p2www/static/styles/duck/desktop.css

i2p2www/templatevars.py

i2p2www/urls.py