[OSGeo-Fundraising] Link to project sponsors

[Jason Birch]

FrankW wrote:

---------------
+1 - But I think these should come after the foundation sponsors, not
before.
---------------

If we're going to do this for projects do we need to do it for local
chapters too?

If so, I'd suggest something like (under the main sponsorship section):

<p>Various OSGeo projects and local chapters have their own sponsors.
Please find links to these below:</p>
<p><strong>Project Sponsor Pages</strong></p>
<ul>
<li><a href="...">GDAL/OGR</a></li>
<li>...</a></li>
</ul>

<p><strong>Local Chapter Sponsor Pages</strong></p>
<ul>
<li><a href="...">OSGeo Japan</a></li>
<li>...</a></li>
</ul>

Jason