Add LFNW to clients

Closes #1796

_includes/clients.html

@@ -31,7 +31,11 @@
                         <img src="img/logos/pgconf.png" class="img-responsive img-centered" alt="">
                     </a>
                 </div>
-
+                <div class="col-md-3 col-sm-6">
+                   <a href="https://lfnw.org/">
+                       <img src="img/logos/linuxfest-northwest.png" class="img-responsive img-centered" alt="LinuxFest Northwest">
+                   </a>
+               </div>
             </div>
         </div>
     </aside>

img/logos/linuxfest-northwest.svg

@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="200"
+   height="50"
+   viewBox="0 0 52.916665 13.229167"
+   version="1.1"
+   id="svg8"
+   inkscape:version="0.92.2 5c3e80d, 2017-08-06"
+   sodipodi:docname="linuxfest-northwest.svg">
+  <defs
+     id="defs2" />
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="3.959798"
+     inkscape:cx="61.418183"
+     inkscape:cy="78.593621"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     units="px"
+     inkscape:window-width="1920"
+     inkscape:window-height="2088"
+     inkscape:window-x="1920"
+     inkscape:window-y="35"
+     inkscape:window-maximized="0" />
+  <metadata
+     id="metadata5">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(0,-283.77082)">
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:7.60915089px;line-height:0.89999998em;font-family:Arvo;-inkscape-font-specification:'Arvo Bold';text-align:center;writing-mode:lr-tb;text-anchor:middle;opacity:1;fill:#aaaaaa;fill-opacity:1;stroke:none;stroke-width:0.0054786;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       x="26.391455"
+       y="289.78687"
+       id="text817"><tspan
+         sodipodi:role="line"
+         x="26.391455"
+         y="289.78687"
+         style="line-height:0.89999998em;fill:#aaaaaa;fill-opacity:1;stroke:none;stroke-width:0.0054786"
+         id="tspan819">LinuxFest</tspan><tspan
+         sodipodi:role="line"
+         x="26.391455"
+         y="296.6351"
+         style="line-height:0.89999998em;fill:#aaaaaa;fill-opacity:1;stroke:none;stroke-width:0.0054786"
+         id="tspan823">Northwest</tspan></text>
+  </g>
+</svg>