Add interactive map

Closes #9 (closed)

static/scripts/map.js

+var map = L.map("map").setView([54.004, -2.55], 5);
+
+L.tileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png", {
+	attribution: "&copy; <a href=\"https://www.openstreetmap.org/copyright\">OpenStreetMap</a> contributors"
+}).addTo(map);
+
+for (let workspace of mapData) {
+	L.marker(workspace.latlong).addTo(map)
+		.bindPopup(`<div class="popup"><div><a href="/workspace/${ encodeURIComponent(workspace.id) }" class="popup-title">${
+			escapeHTML(workspace.name)
+		}</a></div><div>Phone: <a href="tel:${ escapeHTML(workspace.phoneNumber) }">${
+			escapeHTML(workspace.phoneNumber)
+		}</a></div><div>Email: <a href="mailto:${ escapeHTML(workspace.email) }">${
+			escapeHTML(workspace.email)
+		}</a></div><div>Website: <a href="${ escapeHTML(workspace.website) }">${
+			escapeHTML(workspace.website)
+		}</a></div><div>${ escapeHTML(workspace.address) }</div></div>`);
+}
+
+function escapeHTML(html) {
+	let lookup = Object.create(null);
+	lookup["<"] = "&lt;"
+	lookup[">"] = "&gt;"
+	lookup["\""] = "&quot;"
+	lookup["&"] = "&amp";
+	return html.replace(/[<>"&]/g, v => lookup[v] || "");
+}
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