Fix some broken links in the GHOP 2008 Program home page mock-up.

Finished migrating the "proto" app (which only contained a Person profile edit form) to the new combined trunk/app layout. Also, moved the form template from profile.html to profile/edit.html, to follow the "one template per view" approach (rather than have read-write vs. read-only logic in a single template).

Move app.yaml to app.yaml.template and add app.yaml to svn:ignore in trunk/app. Each Google App Engine instance needs its own "application:" ID, and this should *not* be committed into the SoC SVN repository in trunk/app. (Individual deployment branches *will* have app.yaml files with Google App Engine application IDs in them, just not trunk/app.)