all: remove references to AUTHORS, CONTRIBUTORS files

Also fix unnecessary capitalization in blog/experiment.md.

For golang/go#53961.

Change-Id: Ief95e4cdd2085c081a4ad97ffc8678db75bfce69
Reviewed-on: https://go-review.googlesource.com/c/website/+/418930
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>

_content/blog/1year.md

@@ -27,7 +27,7 @@ a chord with a broad cross-section of the programming community.
 That cross-section grew to become a dedicated community of enthusiastic Go coders.
 Our [mailing list](http://groups.google.com/group/golang-nuts) has over 3,800 members,
 with around 1,500 posts each month.
-The project has over 130 [contributors](/CONTRIBUTORS)
+The project has over 130 contributors
 (people who have submitted code or documentation),
 and of the 2,800 commits since launch almost one third were contributed
 by programmers outside the core team.

_content/blog/3years.md

@@ -20,7 +20,7 @@ and experience with the language.
 
 Since the open source launch,
 we've been joined by
-[hundreds of external contributors](/CONTRIBUTORS),
+hundreds of external contributors,
 who have extended and improved Go in myriad ways,
 including writing a Windows port from scratch.
 We added a package management system

_content/blog/experiment.md

@@ -893,8 +893,8 @@ design problems for package installation.
 When people asked about versions,
 we encouraged them to experiment by
 creating additional tools, and they did.
-And we encouraged package AUTHORS
-to provide their USERS
+And we encouraged package authors
+to provide their users
 with the same backwards compatibility
 we did for the Go 1 libraries.
 Quoting [the Go FAQ](/doc/faq#get_version):

_content/blog/hello-world.md

@@ -45,7 +45,7 @@ including many entirely new packages, a sizable portion written by external cont
 Speaking of third parties, since launch a vibrant community has flourished
 on our [mailing list](http://groups.google.com/group/golang-nuts/) and
 irc channel (#go-nuts on freenode).
-We have officially added [more than 50 people](/CONTRIBUTORS) to the project.
+We have officially added more than 50 people to the project.
 Their contributions range from bug fixes and documentation corrections to
 core packages and support for additional operating systems (Go is now supported under FreeBSD,
 and a [Windows port](http://code.google.com/p/go/wiki/WindowsPort) is underway).

_content/doc/contribute.html

@@ -163,7 +163,7 @@ <h3 id="cla">Step 1: Contributor License Agreement</h3>
 to the <a href="mailto:golang-dev@googlegroups.com"><code>golang-dev</code>
 mailing list</a>.
 This will let us know the situation so we can make sure an appropriate agreement is
-completed and update the <code>AUTHORS</code> file.
+completed.
 </p>
 
 
@@ -1014,12 +1014,7 @@ <h3 id="copyright">Copyright headers</h3>
 Files in the Go repository don't list author names, both to avoid clutter
 and to avoid having to keep the lists up to date.
 Instead, your name will appear in the
-<a href="/change">change log</a> and in the <a
-href="/CONTRIBUTORS"><code>CONTRIBUTORS</code></a> file and perhaps the <a
-href="/AUTHORS"><code>AUTHORS</code></a> file.
-These files are automatically generated from the commit logs periodically.
-The <a href="/AUTHORS"><code>AUTHORS</code></a> file defines who &ldquo;The Go
-Authors&rdquo;&mdash;the copyright holders&mdash;are.
+<a href="/change">change log</a>.
 </p>
 
 <p>

_content/project.html

@@ -11,7 +11,7 @@
 <p>
 Go is an open source project developed by a team at
 <a href="https://google.com/">Google</a> and many
-<a href="/CONTRIBUTORS">contributors</a> from the open source community.
+contributors from the open source community.
 </p>
 
 <p>