Add Web UI to see when conference websites appeared

Closes: #4

web_view.py

@@ -0,0 +1,25 @@
+#!/usr/bin/python3
+"""When conference websites appeared."""
+
+import flask
+
+from conference import LiveConference, load_yaml
+
+app = flask.Flask(__name__)
+app.debug = False
+
+
+@app.route("/")
+async def index() -> str:
+    """Index page."""
+    conferences = load_yaml("conferences")
+    live: list[LiveConference] = load_yaml("live")
+
+    for c in live:
+        c["url"] = conferences[c["conference"]].format(year=c["year"])
+
+    return flask.render_template("index.html", live=live, conferences=conferences)
+
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0")