Migrating Seaside book to Pillar on github

Hi

I decided to start to migrate the Seaside book to Pillar and make it a
community-oriented book.
I will work regularly on it and offer it as a gift to the community.

https://github.com/SquareBracketAssociates/DynamicWebDevelopmentWithSeaside

If some of you want to join the effort, you are welcome.

Stef