resources: remove unused icons

Gitlab: #477
Change-Id: Ie8be0721017f18de656874a0b82cc8d5a97276fa

resources/icons/stop_24dp.svg

-<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M0 0h24v24H0z" fill="none"/><path d="M6 6h12v12H6z" fill="#ffffff"/></svg>
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resources/images/quote.svg

-<?xml version="1.0" encoding="UTF-8"?>
-<svg width="47px" height="30px" viewBox="0 0 47 30" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-    <title>noun_Quote_3101618</title>
-    <g id="CONVERSATION-À-PLUS" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" opacity="0.7">
-        <g id="04_JAMI_CONV_Invitation" transform="translate(-702.000000, -310.000000)" fill="#1AB6FF" fill-rule="nonzero">
-            <g id="noun_Quote_3101618" transform="translate(702.000000, 310.000000)">
-                <path d="M9.24003238,27.2740291 C8.58821922,28.5250019 9.49495696,30 10.9415649,30 C11.5043326,30 12.0360615,29.7625927 12.4039467,29.349732 C14.4647143,27.033648 21.2225055,18.9494095 21.9282548,11.8341297 C21.9725231,11.4475374 22,11.0554933 22,10.6570059 C22,10.3333588 21.9811732,10.0458928 21.9542052,9.77527819 C21.4499531,3.84207854 15.9418521,-0.717231757 9.52090737,0.0936206879 C4.60101556,0.715637692 0.635182818,4.63161885 0.0734328381,9.40801556 C-0.615525018,15.279757 3.62660323,20.3376721 9.30414515,21.188175 C10.1823883,21.3210042 10.7538061,22.1482124 10.5085493,22.976412 L9.24003238,27.2740291 Z" id="Path"></path>
-                <path d="M34.2399734,27.2740291 C33.588666,28.5250019 34.4948991,30 35.9415138,30 C36.504284,30 37.0355066,29.7625927 37.4039023,29.349732 C39.4651882,27.033648 46.2225019,18.9494095 46.9287633,11.8341297 C46.972523,11.4475374 47,11.0554933 47,10.6570059 C47,10.3333588 46.9811731,10.0458928 46.954205,9.77527819 C46.4499506,3.84207854 40.9418241,-0.717231757 34.5203408,0.0936206879 C29.6004263,0.715637692 25.6345752,4.63161885 25.0733314,9.40851119 C24.3848792,15.279757 28.6270271,20.3376721 34.3045953,21.188175 C35.1828425,21.3210042 35.7542629,22.1482124 35.509005,22.976412 L34.2399734,27.2740291 Z" id="Path"></path>
-            </g>
-        </g>
-    </g>
-</svg>
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