Remove Promscale from docs (#601)

[Promscale has been
discontinued](timescale/promscale#1836 (comment))

content/docs/next-release/_index.md

@@ -31,7 +31,7 @@ Uber published a blog post, [Evolving Distributed Tracing at Uber](https://eng.u
   * [OpenTracing](http://opentracing.io/)-inspired data model
   * Uses consistent upfront sampling with individual per service/endpoint probabilities
   * Multiple built-in storage backends: Cassandra, Elasticsearch, in-memory
-  * Community supported external storage backends via gRPC plugin: [PostgreSQL with Promscale](https://github.com/timescale/promscale#promscale-for-jaeger-and-opentelemetry), [ClickHouse](https://github.com/jaegertracing/jaeger-clickhouse)
+  * Community supported external storage backends via gRPC plugin: [ClickHouse](https://github.com/jaegertracing/jaeger-clickhouse)
   * System topology graphs
   * Adaptive sampling
   * Post-collection data processing pipeline (coming soon)
@@ -49,8 +49,8 @@ See [Features](./features/) page for more details.
     * [Kafka](./deployment/#kafka)
     * memory storage
     * certified grpc-plugins:
-      * [PostgreSQL with Promscale](./deployment/#remote-storage-model)
       * [ClickHouse](./deployment/#sidecar-model)
+
 ## Quick Start
 See [running a docker all in one image](getting-started#all-in-one).
 

content/docs/next-release/deployment.md

@@ -764,11 +764,9 @@ docker run \
   jaegertracing/all-in-one:{{< currentVersion >}}
 ```
 
-Available remote storage backends:
+Known remote storage backends:
 
-* [PostgreSQL with Promscale](https://github.com/timescale/promscale#promscale-for-jaeger-and-opentelemetry) - Jaeger and Prometheus storage backend built on PostgreSQL. For more information, see [sending data using the Jaeger Collector](https://docs.timescale.com/promscale/latest/send-data/jaeger/).
-  * Implements full Jaeger's Remote Storage API; can be used as a span storage backend.
-  * Supports remote storage API for Prometheus, thus can be used as a metrics storage backend for [SPM](../spm).
+* N/A
 
 ## Metrics Storage Backends
 

content/docs/next-release/features.md

@@ -30,7 +30,7 @@ Since v1.35, the Jaeger backend can receive trace data from the OpenTelemetry SD
 
 Jaeger can be used with a growing a number of storage backends:
 * It natively supports two popular open source NoSQL databases as trace storage backends: Cassandra 3.4+ and Elasticsearch 5.x/6.x/7.x.
-* It integrates via a gRPC API with other well known databases that have been certified to be Jaeger compliant: [PostgreSQL with Promscale](https://github.com/timescale/promscale#promscale-for-jaeger-and-opentelemetry), [ClickHouse](https://github.com/jaegertracing/jaeger-clickhouse).
+* It integrates via a gRPC API with other well known databases that have been certified to be Jaeger compliant: [ClickHouse](https://github.com/jaegertracing/jaeger-clickhouse).
 * There is embedded database support using [Badger](https://github.com/dgraph-io/badger) and simple in-memory storage for testing setups.
 * There are ongoing community experiments using other databases, such as ScyllaDB, InfluxDB, Amazon DynamoDB, Logz.io.