Fix typo on homepage

Smallest PR ever.
Merge pull request #4 from ThibWeb/patch-1

Fix typo on homepage
Note about the `pages` folder
Revise note about the `pages` folder
Fix a lot of typos

Obtained by pasting each page into Word and looking for red underlines.
Move blog.html into blog/
Add notice about the “blog”.
add link to explain what Bower is
Blog notice: only point to twitter
80% statCounter