New website code and rss feeds

Kris has been heavily reworking and cleaning up the code that runs this site (now can be found in the hg repo under werc) including implementing rss feeds for all blogs!

There have also been some minor improvements, like automatic blog setup for user and project blog directories and other minor fixes.

Dave Eckhardt proposed that we have a table of projects that tracks the last commit and last blog post for each project, a prototype of this can be found in /projects/table.

Enjoy and please report any issues or suggestions in #plan9.