[rekonq] Homepage style

[Lionel Chauvin]

I really like these homepages.
I would like criticize if you wish.
About nferenc's homepage: grey is darker than the oxygen's standard grey.
About homepage layout:
- it is not adapted for small screens.
- space between previews is fixed and too large.
- the header is useless and take space. We don't need ads like google ^^
- search engine is useless (like it is currently).
- it is difficult to find recent pages: previews for them would make this task easier.
- pages closed with a previous execution of rekonq are not shown in 'Recently closed pages'.