LW welcome post scraps

<a href="/user/MBlume/overview/">MBlume</a> and other contributors wrote the <a href="/lw/b9/welcome_to_less_wrong/">original version</a> of this welcome post, and it's <a href="/tag/welcome/">been added to</a> since, <a href="/lw/h3p/welcome_to_less_wrong_5th_thread_march_2013/">most recently</a> by <a href="http://lesswrong.com/user/orthonormal/overview/">orthonormal</a>, whose post I've used with minimal changes. Thank you to you all!