Move webhook pages to /hook/ID and inbound URLs to /h/UUID (closes #367)

The webhook page and everything under it move from /source/ID to
/hook/ID, the list and new-webhook form to /hooks and /hooks/new, and
the event log from .../logs to /hook/ID/events, body download
included. Entrypoint URLs move from /webhook/UUID to /h/UUID, and the
webhook page shows only that form. The old paths are gone.

Links, redirects, form actions, tests, comments and the README follow.
Go identifiers and template file names are unchanged. A new route test
posts to the entrypoint URL the webhook page shows and checks that the
receiver rate limit applies to it.

Model: opus-5-5

internal/server/sentry_test.go

@@ -153,7 +153,7 @@ func (c sentryCase) router() http.Handler {
 		sentryhttp.New(sentryhttp.Options{Repanic: true}).Handle,
 	)
 	router.HandleFunc("/pages/login", handler)
-	router.HandleFunc("/webhook/{uuid}", handler)
+	router.HandleFunc("/h/{uuid}", handler)
 
 	return router
 }
@@ -191,7 +191,7 @@ func sentryLoginRequest(client *sentry.Client) *http.Request {
 // concrete path carries the entrypoint capability.
 func sentryReceiverRequest(client *sentry.Client) *http.Request {
 	return sentryRequest(
-		client, "/webhook/"+sentryReceiverUUID, "payload=hello",
+		client, "/h/"+sentryReceiverUUID, "payload=hello",
 	)
 }
 
@@ -316,7 +316,7 @@ func TestSentryScrub_ReplacesTheCapabilityPathWithTheRoutePattern(
 		t, marshalEvent(t, event), sentryReceiverUUID,
 	)
 	assert.Equal(
-		t, "http://example.com/webhook/{uuid}", event.Request.URL,
+		t, "http://example.com/h/{uuid}", event.Request.URL,
 	)
 }
 
@@ -401,7 +401,7 @@ func TestSentryScrub_TransactionDispatchIsUnscrubbedWithoutTheHook(
 func TestSentryScrub_FallsBackWithoutARoutePattern(t *testing.T) {
 	t.Parallel()
 
-	concrete := "https://example.com/webhook/" + sentryReceiverUUID
+	concrete := "https://example.com/h/" + sentryReceiverUUID
 
 	// A request with no chi routing context on it at all, which is
 	// what an event captured outside the router would carry.
@@ -426,7 +426,7 @@ func TestSentryScrub_FallsBackWithoutARoutePattern(t *testing.T) {
 
 			event := sentry.NewEvent()
 			event.Request = &sentry.Request{URL: concrete}
-			event.Transaction = "POST /webhook/" +
+			event.Transaction = "POST /h/" +
 				sentryReceiverUUID
 
 			scrubbed := server.ScrubSentryRequestForTest(
@@ -459,9 +459,9 @@ func TestSentryScrub_WithholdsUnparseableValues(t *testing.T) {
 
 	event := sentry.NewEvent()
 	event.Request = &sentry.Request{
-		URL: "/webhook/" + sentryReceiverUUID,
+		URL: "/h/" + sentryReceiverUUID,
 	}
-	event.Transaction = "/webhook/" + sentryReceiverUUID
+	event.Transaction = "/h/" + sentryReceiverUUID
 
 	scrubbed := server.ScrubSentryRequestForTest(event, nil)
 	require.NotNil(t, scrubbed)