MOVE: All js, css and images to the html dir

I've moved all the javascript, css, images and stuff to the html dir;
because it's the default nginx root. As such, it simplifies the
configuration a bit.
FIX: simplify Nginx configuration

I've simplified nginx configuration, and also reflected the changes that
I've made to the structure. Do NOT remove the empty location block, it
is necessary.
ADD: gitignore file ignoring logs

I've added this file so we stop committing the logs and pid files. They
can contain sensitive info, and therefore, are not meant to be in any
commit.
DEL: pid file

I've deleted the pid file, according to the .gitignore contents