use single chevrons instead of double

Long ago, "foo » bar" used to be the fancier version of "foo > bar" in
navbars, breadcrumbs, etc. But now let's go with "foo › bar" which looks
much lighter.

(reminder for future-me: the reversed one in index.html is not a typo)
style: remove redundant border-top
style: do not wrap <pre>
style: remove the <pre> border; indent instead
irssi-autoidentify: examples overflow the page
irssi-autoidentify: strongly recommend account:password
style: move <pre> style next to .terminal class & line-wrap it
style: use a specific .example class for indented examples
blag: miscellaneous format fixes

* add style classes for examples

* use <blockquote> for quoted logs that don't really need to be <pre>'d

* put <wbr> before punctunation as per Yahoo Style Guide
blag: various amendments to the posts' content
style: increase line spacing for <pre>
journal: link to writings in the header
startkeylogger: use <blockquote>
irssi-{connect,autoidentify}: add <pre> classes
style: fix a typo that broke irssi-connect.html
style: add a missing .purple class
the "Irssi" name is usually capitalized
writings: do not over-nest the article list
writings: add a link to my IRC-SASL S2S article