Change title to 'principles', update preamble

Incorporate suggestions from tboning and others to change
the title to something other than rules, but which still emphasizes
that these are important shared beliefs.

Incorporate suggestions form achernya and others to remove any
negative phrasing from the preamble.
Add quote in well-actually section

Incorporate quote from iannucci to better illustrate why a
well-actually may not have the intended effect.
Rewrite the end section; clarify enforcement

Incorporate suggestions from dove and others to clarify how
enforcement will work.

Hopefully this section now communicates that this will be largely
community enforced, but will not preclude anyone who has been hurt by
a "violation" of these rules from coming to the EC for assistance.
The goal is to make it clear that there are not specific punishments
for each instance of "well-actually" or "Sorry but not sorry", but
simultaneously not in any way deny the EC the power to take action
against any SIPB member or propsective who is making the office an
unwelcoming (or even hostile) environment.