chore(bigtable): removes cbt source code (#5843)

* chore(bigtable): removes cbt source code

* chore: added back README with redirect

* fix: refactored Bigtable loadtest.go

* fix: scantest

* fix: dependencies

* fix: build

* fix: go.sum

bigtable/cmd/cbt/README.md

@@ -1,58 +1,4 @@
-# CBT: Cloud Bigtable Tool
+# Cloud Bigtable CLI tool (cbt)
 
-This is the source for `cbt`.
-
-## Build and Run
-To build the tool locally, run this command in this directory:
-
-```
-go build .
-```
-
-That will build the cbt binary in that directory. To run commands with the `cbt` you built (rather
-than the official one) invoke it with the directory prefix like this:
-
-```
-./cbt help
-```
-
-## Documentation
-
-This tool gets documented on the [Go packages website](https://pkg.go.dev/cloud.google.com/go/bigtable/cmd/cbt)
-as well as the [cloud site](https://cloud.google.com/bigtable/docs/cbt-reference).
-
-### Go Package Documentation
-
-This command will generate a file with a package description which gets used for the pkg.go.dev. You should update this after any changes to the usage or descriptions of the commands. To
-generate the file, run:
-
-```
-go generate
-```
-
-The output will be in [cbtdoc.go](cbtdoc.go).
-
-You may want to verify this looks good locally. To do that, you will need to generate the doc into
-your GOPATH version of the directory, then run `godoc` and you can view the [local version](http://localhost:6060/pkg/cloud.google.com/go/bigtable/cmd/cbt/)
-
-```
-go run . -o $(go env GOPATH)/src/cloud.google.com/go/bigtable/cmd/cbt/cbtdoc.go doc
-godoc
-```
-
-### Cloud Site Documentation
-
-The Cloud documentation uses the `cbt mddoc` command to generate part of the [cbt Reference](https://cloud.google.com/bigtable/docs/cbt-reference) page.
-To preview what it will look like upon generation, you can generate it into a file with the command:
-
-```
-go run . -o doc.md mddoc
-```
-
-This will create a file doc.md. You don't need to check it into this repository, so delete
-it once you are happy with the output.
-
-## Configuration
-
-The configuration for the options (`-project`, `-instance`, and `-creds`) is in [cbtconfig.go](../../internal/cbtconfig/cbtconfig.go).
-So change that file if you need to modify those.
+Development on the `cbt` tool has moved to
+[another repo](https://github.com/googleapis/cloud-bigtable-cbt-cli).