QL: update the readme

Author: erik-krogh

ql/README.md

@@ -1,19 +1,10 @@
-# QL analysis support for CodeQL
+# CodeQL for CodeQL
 
-- *Part of the May 2021 [code scanning hackathon](https://github.com/github/code-scanning-hackathon/issues/3).*
-- *Part of the October 2021 [code scanning hackathon](https://github.com/github/code-scanning-hackathon/issues/61).*
+CodeQL for CodeQL analyses QL code to find some common bug patterns.   
+This analysis is mostly used as a PR check in [`github/codeql`](https://github.com/github/codeql).   
+CodeQL for CodeQL is experimental technology and not a supported product
 
-Under development.
-
-## Viewing the alerts from github/codeql and github/codeql-go
-
-**TLDR: View https://github.com/github/codeql-ql/security/code-scanning?query=branch%3Anightly-changes-alerts periodically.**
-
-The [`nightly-changes-alerts` branch](https://github.com/github/codeql-ql/tree/nightly-changes-alerts) contains nightly snapshots of QL related code from [github/codeql](https://github.com/github/codeql) and [github/codeql-go](https://github.com/github/codeql-go). The corresponding [code-scanning alerts](https://github.com/github/codeql-ql/security/code-scanning?query=branch%3Anightly-changes-alerts) are from the [default query suite](https://github.com/github/codeql-ql/blob/main/ql/src/codeql-suites/ql-code-scanning.qls).
-
-The branch and alerts are updated every night by the [`nightly-changes.yml` workflow](https://github.com/github/codeql-ql/actions/workflows/nightly-changes.yml).
-
-Ideally, the scans would happen automatically as part of the PRs. That requires more coordination, and is tracked here: https://github.com/github/codeql-coreql-team/issues/1669.
+Some setup is required to use CodeQL for CodeQL (see the below sections). 
 
 ## Building the tools from source
 
@@ -43,22 +34,15 @@ Then run
 codeql database create <database-path> -l ql -s <project-source-path> --search-path <extractor-pack-path>
 ```
 
+CodeQL can be configured to remember the extractor by setting the config file `~/.config/codeql/config` to: 
+```bash
+--search-path /full/path/to/extractor-pack
+```
+
 ## Running qltests
 
 Run
 
 ```bash
 codeql test run <test-path> --search-path <repository-root-path>
 ```
-
-## GitHub Actions
-
-In addition to the above nightly scans of the known CodeQL repositories, the following Actions are of particular interest:
-
-- [`bleeding-codeql-analysis.yml`](https://github.com/github/codeql-ql/actions/workflows/bleeding-codeql-analysis.yml)
-  - runs on all PRs, displays how alerts for the known CodeQL repositories change as consequence of the PR
-  - the code from the known CodeQL repositories should be updated occasionally by running [`repo-tests/import-repositories.sh`](https://github.com/github/codeql-ql/blob/main/repo-tests/import-repositories.sh) locally, and creating a PR.
-  - produces an artifact built `ql` database in
-- [`build.yml`](https://github.com/github/codeql-ql/actions/workflows/build.yml)
-  - produces an artifact with the `ql` extractor and the `ql` query pack in
-