Sage cell server - do I really need so many makeSagecell invocations?

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The way it's written right now, you do need specific locations for each one, so yes, you do need 15 invocations. That said, you could make some sort of jquery something that, when a div gets a certain class, will automatically make it a sagecell. Sorry; that's a little vague.

Here's a quick example of some HTML+javascript that automatically makes all elements with a given class into sagecells: http://sage.math.washington.edu/home/alexkramer/sagecell_test.html (view source to see the JS) ... However, it looks like right now there's some sort of CSS bug that's preventing a lot of debugging-type printing from being dynamically hidden. But it at least shows that what you want is certainly possible to do.

A non-sage solution to your problem would be to use a static site generator / HTML templates. I've used jinja2 before, it's pretty easy to use and powerful (and built using Python).

You can use jinja to do things like this (stolen from their webpage)

{% extends "layout.html" %}
{% block body %}
  <ul>
  {% for user in users %}
    <li><a href="{{ user.url }}">{{ user.username }}</a></li>
  {% endfor %}
  </ul>
{% endblock %}