doc: reflect Benchmarking WG is dechartered

Refs: nodejs/TSC#955

README.md

@@ -1,53 +1,14 @@
 # Benchmarking Work Group
 
-## Mandate
+The benchmarking WG is now de-chartered and is no longer active.
 
-The Benchmark working group's purpose is to gain consensus for an agreed set of benchmarks that can be used to:
-
-1. Track and evangelize performance gains made between Node releases
-2. Avoid performance regressions between releases
-
-Its responsibilities are:
-
-1. Identify 1 or more benchmarks that reflect customer usage.  Likely need more than one to cover typical Node use cases including low-latency and high concurrency
-2. Work to get community consensus on the list chosen
-3. Add regular execution of chosen benchmarks to Node builds
-4. Track/publicize performance between builds/releases
-
-The path forward is to:
- * Define the important
-   [use cases](https://github.com/nodejs/benchmarking/blob/master/docs/use_cases.md)
- * Define the key
-   [runtime attributes](https://github.com/nodejs/benchmarking/blob/master/docs/runtime_attributes.md)
- * Find/create benchmarks that provide good coverage for the
-   use cases and attributes
-   ([current table](https://github.com/nodejs/benchmarking/blob/master/docs/use_cases.md))
-
-See here for information about the infrastructure in place so far:
-https://github.com/nodejs/benchmarking/blob/master/benchmarks/README.md
-
-## Logistics
-
-### Semi-monthly Meetings
-
-Meetings of the working group typically occur every third Tuesday as shown on the
-the node.js project [calendar](https://nodejs.org/calendar).
-A few days before each meeting, an [issue](https://github.com/nodejs/benchmarking/issues)
-will be created with the date and time of the meeting.
-The issue will provide schedule logistics as well as
-an agenda, links to meeting minutes, and
-information about how to join as a participant or a viewer.
-
-## Current Project Team Members
+## Emeritus Project Team Members
   + Michael Dawson (@mhdawson) Facilitaor 
   + Uttam Pawar (@uttampawar)
   + Michael Paulson (@michaelbpaulson)
   + Gareth Ellis (@gareth-ellis)
   + Kunal Pathak (@kunalspathak)
   + Jamie Davis (@davisjam)
-
-## Emeritus Project Team Members
-
   + Trevor Norris (@trevnorris)
   + Ali Sheikh (@ofrobots)
   + Yosuke Furukawa (@yosuke-furukawa)