Add links to the OCaml Manual.
Miscellaneous presentation improvements.
Remove GODI from the install page.

GODI is no longer being developed
http://blog.camlcity.org/blog/godi_shutdown.html
+ AMNH (replaying #186)
Remove tpl/front_news.mpp as everything is in rss2html.
"preview" also makes relative News URLs (with fragment "#").
Display logos on the "Commercial Support" page.
Mention IRC and link to the commercial support page.
Add option --img to rss2html → distinguish various news channels.
Merge the two links to Florent Monnier's tutorial.
Change the video sizes so they do not overlap.
delete robots.txt

This is no longer needed. It was used long ago to avoid robots
traversing `ocaml.org/master` where we were publishing a dev preview of
the site.
remove old obsolete build scripts
merge new and old README files
move all files from src/ one level up

As requested in #227.
remove old template in src/lib

Only content of src/lib was the previous template used with Weberizer.
rename tpl/ to template/

As discussed in #227.
rename app/ to script/

In anticipation of also putting bash scripts in here. The term `app`
implies something bigger than simple scripts.
.gitignore: remove src/lib/ items

Should have been done with 915be7ca2b9dd83b95fd66ca04b3f6fccfdea419.
move all script files to script/ directory