doc: remove Go Security Policy page (moved to x/website)

This page has moved to the x/website repo in CL 211300 (commit
golang/website@3c8b7f99cadaa000e642595d0fabcd9ac496f335).
Remove the old copy in this repo since it's no longer used.

Updates #29206

Change-Id: I8b3396d9e42d1e7262a8cde9577962d33b215836
Reviewed-on: https://go-review.googlesource.com/c/go/+/211301Reviewed-by: Filippo Valsorda <filippo@golang.org>

doc/security.html

-<!--{
-	"Title": "Go Security Policy",
-	"Path":  "/security",
-	"Template": true
-}-->
-
-<h2>Implementation</h2>
-
-<h3>Reporting a Security Bug</h3>
-
-<p>
-Please report to us any issues you find.
-This document explains how to do that and what to expect in return.
-</p>
-
-<p>
-All security bugs in the Go distribution should be reported by email to
-<a href="mailto:security@golang.org">security@golang.org</a>.
-This mail is delivered to a small security team.
-Your email will be acknowledged within 24 hours, and you'll receive a more
-detailed response to your email within 72 hours indicating the next steps in
-handling your report.
-</p>
-
-<p>
-To ensure your report is not marked as spam, please include the word "vulnerability"
-anywhere in your email. Please use a descriptive subject line for your report email.
-</p>
-
-<p>
-After the initial reply to your report, the security team will endeavor to keep
-you informed of the progress being made towards a fix and full announcement.
-These updates will be sent at least every five days.
-In reality, this is more likely to be every 24-48 hours.
-</p>
-
-<p>
-If you have not received a reply to your email within 48 hours or you have not
-heard from the security team for the past five days please contact the Go
-security team directly:
-</p>
-
-<ul>
-<li>Primary security coordinator: <a href="mailto:filippo@golang.org">Filippo Valsorda</a>.</li>
-<li>Secondary coordinator: <a href="mailto:agl@golang.org">Adam Langley</a>.</li>
-<li>If you receive no response, mail <a href="mailto:golang-dev@googlegroups.com">golang-dev@googlegroups.com</a> or use the <a href="https://groups.google.com/forum/#!forum/golang-dev">golang-dev web interface</a>.</li>
-</ul>
-
-<p>
-Please note that golang-dev is a public discussion forum.
-When escalating on this list, please do not disclose the details of the issue.
-Simply state that you're trying to reach a member of the security team.
-</p>
-
-<h3>Flagging Existing Issues as Security-related</h3>
-
-<p>
-If you believe that an <a href="https://golang.org/issue">existing issue</a>
-is security-related, we ask that you send an email to
-<a href="mailto:security@golang.org">security@golang.org</a>.
-The email should include the issue ID and a short description of why it should
-be handled according to this security policy.
-</p>
-
-<h3>Disclosure Process</h3>
-
-<p>The Go project uses the following disclosure process:</p>
-
-<ol>
-<li>Once the security report is received it is assigned a primary handler.
-This person coordinates the fix and release process.</li>
-<li>The issue is confirmed and a list of affected software is determined.</li>
-<li>Code is audited to find any potential similar problems.</li>
-<li>If it is determined, in consultation with the submitter, that a CVE-ID is
-required, the primary handler obtains one via email to
-<a href="https://oss-security.openwall.org/wiki/mailing-lists/distros">oss-distros</a>.</li>
-<li>Fixes are prepared for the two most recent major releases and the head/master
-revision. These fixes are not yet committed to the public repository.</li>
-<li>A notification is sent to the
-<a href="https://groups.google.com/group/golang-announce">golang-announce</a>
-mailing list to give users time to prepare their systems for the update.</li>
-<li>Three working days following this notification, the fixes are applied to
-the <a href="https://go.googlesource.com/go">public repository</a> and a new
-Go release is issued.</li>
-<li>On the date that the fixes are applied, announcements are sent to
-<a href="https://groups.google.com/group/golang-announce">golang-announce</a>,
-<a href="https://groups.google.com/group/golang-dev">golang-dev</a>, and
-<a href="https://groups.google.com/group/golang-nuts">golang-nuts</a>.
-</ol>
-
-<p>
-This process can take some time, especially when coordination is required with
-maintainers of other projects. Every effort will be made to handle the bug in
-as timely a manner as possible, however it's important that we follow the
-process described above to ensure that disclosures are handled consistently.
-</p>
-
-<p>
-For security issues that include the assignment of a CVE-ID,
-the issue is listed publicly under the
-<a href="https://www.cvedetails.com/vulnerability-list/vendor_id-14185/Golang.html">"Golang" product on the CVEDetails website</a>
-as well as the
-<a href="https://web.nvd.nist.gov/view/vuln/search">National Vulnerability Disclosure site</a>.
-</p>
-
-<h3>Receiving Security Updates</h3>
-
-<p>
-The best way to receive security announcements is to subscribe to the
-<a href="https://groups.google.com/forum/#!forum/golang-announce">golang-announce</a>
-mailing list. Any messages pertaining to a security issue will be prefixed
-with <code>[security]</code>.
-</p>
-
-<h3>Comments on This Policy</h3>
-
-<p>
-If you have any suggestions to improve this policy, please send an email to
-<a href="mailto:golang-dev@golang.org">golang-dev@golang.org</a> for discussion.
-</p>
-
-<h3>PGP Key for <a href="mailto:security@golang.org">security@golang.org</a></h3>
-
-<p>
-We accept PGP-encrypted email, but the majority of the security team
-are not regular PGP users so it's somewhat inconvenient. Please only
-use PGP for critical security reports.
-</p>
-
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