implement the veeeeeeery nice search box

cc @laurent.heirendt

Closes #8

assets/static/search.svg

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="15.130978"
+   height="15.123755"
+   viewBox="0 0 15.130977 15.123755"
+   fill="none"
+   stroke="currentColor"
+   stroke-width="2"
+   stroke-linecap="round"
+   stroke-linejoin="round"
+   version="1.1"
+   id="svg6"
+   sodipodi:docname="search.svg"
+   inkscape:version="1.2.2 (b0a8486541, 2022-12-01)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs10" />
+  <sodipodi:namedview
+     id="namedview8"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     showgrid="false"
+     inkscape:zoom="21.756297"
+     inkscape:cx="9.5834325"
+     inkscape:cy="17.856899"
+     inkscape:window-width="1920"
+     inkscape:window-height="1166"
+     inkscape:window-x="0"
+     inkscape:window-y="2194"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg6" />
+  <ellipse
+     cx="7.5475788"
+     cy="7.5762048"
+     id="circle2"
+     style="stroke-width:1;stroke-dasharray:none"
+     rx="2.7535429"
+     ry="2.7533207" />
+  <path
+     id="line4"
+     d="M 11.823257,11.847855 9.4922683,9.5207383"
+     style="stroke-width:1;stroke-dasharray:none" />
+</svg>