update style + refactor css + reformulate questions

about.html

challenges/websec.html

fireworks.js

index.html

login.html

navbar.html

obfuscated_code/about.html

obfuscated_code/challenges/websec.html

obfuscated_code/fireworks.js

obfuscated_code/footer.html

obfuscated_code/include.js

obfuscated_code/index.html

obfuscated_code/login.html

obfuscated_code/navbar.html

obfuscated_code/static/favicon.png

obfuscated_code/static/footer.png

obfuscated_code/static/geek.gif

obfuscated_code/static/net7-blanc.png

obfuscated_code/static/net7-n7.png

obfuscated_code/static/women7-logo.png