help: Reorder index so that passwords are first
help: Change layout: PGP section

pgp-landing.page has the actual index for the remaining pgp-* pages.
help: Change layout: SSH section

ssh-landing.page has the actual index for the remaining ssh-* pages.
help: Change layout: passwords section

passwords-landing.page has the actual index for the remaining pages about
passwords and password keyrings.
help: Edit <desc> on misc-key-export.page
help: reflow, fix desc on misc-key-import.page
help: Update introduction.page

Add Jim Campbell as a co-author, put passwords on top to give it more
visibility.
help: Delete about-key-strength.page help page
help: Reworded passwords-passphrases.page
help: Changed <desc> on about-diff-private-public
help: about-key-fingerprint: Change <title>,<desc>
help: about-key-servers:<title> change, reword
help: about-keyring.page: Changed <desc>
help: about-pgp.page: Changed <desc>
help: about-ssh.page: Changed <desc>
help: about-subkeys.page: changed <desc>, <title>
help: pgp-advanced-options.page: Edited <desc>
help: Reworded about-key-servers.page
help: Try to improve style of passwords guide page
help: Review password-keyring-create help page

Add a seealso to updating passwords to replace the note from the bottom
of the page. Remove document version number from the revision tag (the
document version corresponds to the package version that it is written
for). Shorten title. Use more active language. Try to make the
instructions more consise (fail at one point, add a TODO to fix later).