Update the help Makefile.am

…so that the build isn't broken.
Remove index.docbook.
Add help stubs

initial commit of basic seahorse task stubs. linking not yet established.
docs: modify index page to include seahorse icon.

Move to media
docs: added page about certs. initial draft of ssh-key description.
docs: added draft to explain public vs private keys.
added draft page on how to create a pgp key.
docs: updated index page. cleaned up key creation pages. added simple page to summarize adding keys.
docs: updated index page. cleaned up key creation pages. added simple page to summarize adding keys.
docs: added group and groups information to learning sections. reworked what-diff-priv-public page
docs: refactored the landing page, moving general info about keys to a separate sub-page.
docs: fixed validation error on learn-about-keys.page
help: Comment on some of the 'learning' pages

Hopefully this commit will be squashed when me merge this branch.
But we can worry about that later.
Added a list of basic terms in introduction.page

Explanation of some technical terms involved.
help: Update introduction.page
help: Added draft for encryption-rsa.page
help: add <include> tag on encryption-rsa.page
help: Update key-servers-what-are-they.page
Updated help: New page stubs

For how to sync, publish retrieve public keys.
help: Update encryption-rsa.page