Docs to update submodules on manual install
Use symlinked gem instead of gem1.8

Seems to be the canonical source on both Debian and Ubuntu
Remove package pinning from manual install docs

[11:46:34] <@mark>   gareth: i don't think the pinning configuration in
the install instructions is necessary any more, but the one i added in
install-site.sh is probably worth keeping, just to say that our versions
of packages should generally have lower priority
[11:47:07] <@mark>   (i'm not 100% sure that that's necessary now, but i
don't think i would have added it without some good reason)
[11:47:11] <@mark>   (possibly rash assumption ;))
Remove wheezy package repo from squeeze instructions

Same reasons as cdd02da
Docs to install packages from system-specific list

Also uses a slightly simpler command to get the package list
Group package dependency docs together

Moves the ruby dependency docs down the page so that all the apt based
package docs are in one section.
Update ubuntu precise package sources

wkhtmltopdf-static and bundler can be installed through apt on
ubuntu
Update adding mySociety Debian Archive repo docs
Move install dependencies after repo setup

Makes it clearer that you've done all the setup and now just need to
update and install
Update system dependencies setup

- Pastable commands to create extra package sources
- Corrected notes about installable packages per-system
Shuffle Configure Database docs

Do all the postgres setup then configure database.yml