build: prepare v0.6.1 release notes

Author: szkiba

releases/v0.6.1.md

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+<!--
+SPDX-FileCopyrightText: 2023 Raintank, Inc. dba Grafana Labs
+
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+xk6-dashboard `v0.6.1` is here 🎉! This release includes:
+
+- [#77](https://github.com/grafana/xk6-dashboard/issues/77) Add missing charts to the *TIMINGS* tab sections
+- [#78](https://github.com/grafana/xk6-dashboard/issues/78) Rename WebSockets *Pong Duration* to *Ping Duration*
+- [#79](https://github.com/grafana/xk6-dashboard/issues/79) Enable short descriptions of graphs
+
+### Add missing charts to the *TIMINGS* tab sections
+
+#### HTTP
+- Request Failed Rate
+- Request Rate
+- Request Blocked
+
+#### Browser
+- Request Failed Rate
+
+#### WebSockets
+- Transfer Rate
+- Sessions Rate
+
+#### gRPC
+- Transfer Rate
+- Streams Rate
+
+### Rename WebSockets *Pong Duration* to *Ping Duration*
+
+The official name is "ping", so renameed it back to the official name (however the measured value is the response time)
+
+### Enable short descriptions of graphs
+
+Added "summary" configuration property (and placeholder value) to panels configuration.