source/tools: Use emdash for quote attribution

Signed-off-by: Alan Orth <alan.orth@gmail.com>
source/tools.html: Remove "What can Linux do for us?" section

I think I meant it to be a note for myself when I originally started
the slides.

Signed-off-by: Alan Orth <alan.orth@gmail.com>
source/tools.html: Add note about line endings

Signed-off-by: Alan Orth <alan.orth@gmail.com>
source/dog-food.html: Add sections about FLOSS

Signed-off-by: Alan Orth <alan.orth@gmail.com>