index.html: support HTML5

Declare explicit doctype and add missing </html> tag.
index.css: Remove unnecessary CSS selectors and properties

Those are all default values, so are unnecessary.
index: Remove unnecessary 'wrap' div and its style
create new chapter
main: complete to 33
main: complete 34 ~ 54
main: complete 55 ~ 74
main: complete 75 ~ 97
main: fix style - shadow box, color on title & contents
main.css: fix width not in body but in category ID
main: add quick link
rename files main.* to dohamsu_2.*
Add link for dohamsu_2.html

Ffix wrong css file name as well.