make notes neon pink and warnings neon orange in the documentation

I like the neon-styled colour scheme for the docs, but the notices and warnings do not stand out enough to jump at the user. Keeping in the contstraints of neon colours, I made notices pink and warnings orange.

Here's a code snippet to show off the fancy new colours:

```
.. note::

    Hello world

.. warning::

   Hello world
```

The diff is hard to see, but here is the code snippet that made this happen:

```
.doc-content .note {border:solid 4px #F5F}.doc-content .warning {border:solid 4px #F93}
```