blog: delete per-repo files, update README.md, go.mod

It would be nice to delete go.mod and let the directory
be part of the x/website module, but right now x/website
requires Go 1.16 and the blog runs on App Engine which
doesn't yet support Go 1.16. So the blog is actually requiring
an older, pre-Go 1.16 version of x/website.

Once App Engine updates to Go 1.16 we can take that next
step of making blog not a submodule.

Or perhaps before that we will get to the point of serving the
blog from the cmd/golangorg server.

One way or another, this will get even simpler.

Change-Id: I04f9b4d4433009c8b204acba9043b2d8a6261189
Reviewed-on: https://go-review.googlesource.com/c/website/+/322791
Trust: Russ Cox <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>

Author: rsc

blog/.gitattributes .gitattributes

@@ -1,2 +1 @@
 .gcloudignore
-.git

blog/.gcloudignore

@@ -1,13 +1,13 @@
 # Go Blog
 
-[![Go Reference](https://pkg.go.dev/badge/golang.org/x/blog.svg)](https://pkg.go.dev/golang.org/x/blog)
+[![Go Reference](https://pkg.go.dev/badge/golang.org/x/website/blog.svg)](https://pkg.go.dev/golang.org/x/website/blog)
 
-This repository holds the Go Blog server code and content.
+This directory holds the Go Blog server code and content.
 
 ## Download/Install
 
-The easiest way to install is to run `go get -u golang.org/x/blog`. You can also
-manually git clone the repository to \$GOPATH/src/golang.org/x/blog.
+The easiest way to install is to run `go get -u golang.org/x/website/blog`. You can also
+manually git clone the repository to \$GOPATH/src/golang.org/x/website.
 
 ## Running Locally
 
@@ -38,7 +38,7 @@ This repository uses Gerrit for code changes. To learn how to submit changes to
 this repository, see https://golang.org/doc/contribute.html.
 
 The main issue tracker for the blog is located at
-https://github.com/golang/go/issues. Prefix your issue with "x/blog:" in the
+https://github.com/golang/go/issues. Prefix your issue with "x/website/blog:" in the
 subject line, so it is easy to find.
 
 ## Deploying

blog/AUTHORS

@@ -1,4 +1,4 @@
-module golang.org/x/blog
+module golang.org/x/website/blog
 
 go 1.11