Add missing SVG assets from a previous commit

internal/webserver/static/icons/download.svg

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+<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 122.88 120.89"><title>download-file</title><path d="M84.58,47a7.71,7.71,0,1,1,10.8,11L66.09,86.88a7.72,7.72,0,0,1-10.82,0L26.4,58.37a7.71,7.71,0,1,1,10.81-11L53.1,63.12l.16-55.47a7.72,7.72,0,0,1,15.43.13l-.15,55L84.58,47ZM0,113.48.1,83.3a7.72,7.72,0,1,1,15.43.14l-.07,22q46,.09,91.91,0l.07-22.12a7.72,7.72,0,1,1,15.44.14l-.1,30h-.09a7.71,7.71,0,0,1-7.64,7.36q-53.73.1-107.38,0A7.7,7.7,0,0,1,0,113.48Z"/></svg>

internal/webserver/static/icons/external-link.svg

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+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 122.6 122.88" style="enable-background:new 0 0 122.6 122.88" xml:space="preserve"><g><path d="M110.6,72.58c0-3.19,2.59-5.78,5.78-5.78c3.19,0,5.78,2.59,5.78,5.78v33.19c0,4.71-1.92,8.99-5.02,12.09 c-3.1,3.1-7.38,5.02-12.09,5.02H17.11c-4.71,0-8.99-1.92-12.09-5.02c-3.1-3.1-5.02-7.38-5.02-12.09V17.19 C0,12.48,1.92,8.2,5.02,5.1C8.12,2,12.4,0.08,17.11,0.08h32.98c3.19,0,5.78,2.59,5.78,5.78c0,3.19-2.59,5.78-5.78,5.78H17.11 c-1.52,0-2.9,0.63-3.91,1.63c-1.01,1.01-1.63,2.39-1.63,3.91v88.58c0,1.52,0.63,2.9,1.63,3.91c1.01,1.01,2.39,1.63,3.91,1.63h87.95 c1.52,0,2.9-0.63,3.91-1.63s1.63-2.39,1.63-3.91V72.58L110.6,72.58z M112.42,17.46L54.01,76.6c-2.23,2.27-5.89,2.3-8.16,0.07 c-2.27-2.23-2.3-5.89-0.07-8.16l56.16-56.87H78.56c-3.19,0-5.78-2.59-5.78-5.78c0-3.19,2.59-5.78,5.78-5.78h26.5 c5.12,0,11.72-0.87,15.65,3.1c2.48,2.51,1.93,22.52,1.61,34.11c-0.08,3-0.15,5.29-0.15,6.93c0,3.19-2.59,5.78-5.78,5.78 c-3.19,0-5.78-2.59-5.78-5.78c0-0.31,0.08-3.32,0.19-7.24C110.96,30.94,111.93,22.94,112.42,17.46L112.42,17.46z"/></g></svg>