docs: Add release notes for v1.8 (#3557)

* docs: Add release notes for v1.8

* Update docs/sources/release-notes/v1-8.md

Co-authored-by: Marc Sanmiquel <[email protected]>

---------

Co-authored-by: Marc Sanmiquel <[email protected]>

docs/sources/release-notes/v1-8.md

@@ -0,0 +1,38 @@
+---
+title: Version 1.8 release notes
+menuTitle: V1.8
+description: Release notes for Grafana Pyroscope 1.8
+weight: 550
+---
+
+# Version 1.8 release notes
+
+We are excited to present Grafana Pyroscope 1.8.
+
+We've improved stability, performance, and documentation.
+
+Notable changes are listed below. For more details, check out the full 1.8.0 changelog: https://github.com/grafana/pyroscope/compare/v1.7.0...v1.8.0.
+
+## Improvements and updates
+
+Version 1.8 includes the following improvements and updates:
+
+* Add ready command to profilecli ([#3497](https://github.com/grafana/pyroscope/pull/3497))
+
+## Fixes
+
+Version 1.8 includes the following fixes:
+
+* Handle context correctly in selectTree during queries on store-gateway with deduplication ([#3504](https://github.com/grafana/pyroscope/pull/3504))
+* Bring back update-contributors but in go ([#3512](https://github.com/grafana/pyroscope/pull/3512))
+* FlameQL: allow dots in tag name ([#3479](https://github.com/grafana/pyroscope/pull/3479))
+* Fix pprof grouping for samples with span_id ([#3450](https://github.com/grafana/pyroscope/pull/3450))
+
+## Documentation improvements
+
+Version 1.8 includes the following documentation updates:
+
+* Fix broken links from doc 404 report ([#3489](https://github.com/grafana/pyroscope/pull/3489))
+* Clarify which URL to use with profilecli ([#3526](https://github.com/grafana/pyroscope/pull/3526))
+* Add notice about heap profiling ([#3494](https://github.com/grafana/pyroscope/pull/3494))
+* Remove old GF_FEATURE_TOGGLES_ENABLE=flameGraph ([#3446](https://github.com/grafana/pyroscope/pull/3446))