Remove LGTM references from README.md + cleanup

Author: sidshank

go/README.md

@@ -1,20 +1,14 @@
 # Go analysis support for CodeQL
 
-This open-source repository contains the extractor, CodeQL libraries, and queries that power Go
-support in [LGTM](https://lgtm.com) and the other CodeQL products that [GitHub](https://github.com)
-makes available to its customers worldwide.
+This sub-folder contains the extractor, CodeQL libraries, and queries that power Go
+support for CodeQL.
 
 It contains two major components:
   - an extractor, itself written in Go, that parses Go source code and converts it into a database
     that can be queried using CodeQL.
   - static analysis libraries and queries written in [CodeQL](https://codeql.github.com/docs/) that can be
     used to analyze such a database to find coding mistakes or security vulnerabilities.
 
-The goal of this project is to provide comprehensive static analysis support for Go in CodeQL.
-
-For the queries and libraries that power CodeQL support for other languages, visit [the CodeQL
-repository](https://github.com/github/codeql).
-
 ## Installation
 
 Clone this repository.
@@ -30,15 +24,9 @@ Code workspace.
 
 To analyze a Go codebase, either use the [CodeQL command-line
 interface](https://codeql.github.com/docs/codeql-cli/) to create a database yourself, or
-download a pre-built database from [LGTM.com](https://lgtm.com/). You can then run any of the
+download a pre-built database from [GitHub.com](https://codeql.github.com/docs/codeql-cli/creating-codeql-databases/#downloading-databases-from-github-com). You can then run any of the
 queries contained in this repository either on the command line or using the VS Code extension.
 
-Note that the [lgtm.com](https://github.com/github/codeql/tree/lgtm.com) branch of this
-repository corresponds to the version of the queries that is currently deployed on LGTM.com.
-The [main](https://github.com/github/codeql/tree/main) branch may contain changes that
-have not been deployed yet, so you may need to upgrade databases downloaded from LGTM.com before
-running queries on them.
-
 ## Contributions
 
 Contributions are welcome! Please see our [contribution guidelines](CONTRIBUTING.md) and our