fix(docs): replace dead Envoy Slack invite link (#9586)

The communityinviter.com app for the Envoy Slack workspace has been
removed and now returns 404. The link is rendered by the site footer
partial, so it appeared on every generated page and the docs link
checker reported 863 broken links.

Point at https://www.envoyproxy.io/slack instead, a redirect the Envoy
project maintains in envoyproxy/envoy-website, so the invite target can
be updated without changing every doc link. Slack answers 403 to
automated clients, so skip that URL in the link checker.

See envoyproxy/envoy#46347 for the upstream invite discussion.

Signed-off-by: Huabing (Robin) Zhao <zhaohuabing@gmail.com>

Author: zhaohuabing

README.md

@@ -49,5 +49,5 @@ Envoy Gateway contributor meetings are held on Thursdays and alternate weekly be
 [meeting]: https://docs.google.com/document/d/1i5wa1VsxIbQw7jbWvGmvy8C4Zpp7SGV1aVViSLgqU4M/edit?usp=sharing
 [community-calendar]: https://zoom-lfx.platform.linuxfoundation.org/meetings/envoy?view=week
 [blog]: https://blog.envoyproxy.io/introducing-envoy-gateway-ad385cc59532
-[Envoy Slack workspace]: https://communityinviter.com/apps/envoyproxy/envoy
+[Envoy Slack workspace]: https://www.envoyproxy.io/slack
 [Envoy Gateway channel]: https://envoyproxy.slack.com/archives/C03E6NHLESV

SECURITY.md

@@ -36,7 +36,7 @@ We announce advisories and patched releases through:
 
 - [GitHub Security Advisories](https://github.com/envoyproxy/gateway/security/advisories)
 - The [GitHub Releases page](https://github.com/envoyproxy/gateway/releases)
-- The `#gateway-users` channel in the [Envoy Slack workspace](https://communityinviter.com/apps/envoyproxy/envoy)
+- The `#gateway-users` channel in the [Envoy Slack workspace](https://www.envoyproxy.io/slack)
 - The [envoy-gateway-announce mailing list](https://groups.google.com/g/envoy-gateway-announce)
 
 Security fixes are merged into active, non-EOL release branches as patch releases when the affected versions are still supported. See the [release matrix](https://gateway.envoyproxy.io/news/releases/matrix/) for support windows and the [patch release process](https://gateway.envoyproxy.io/community/releasing/#patch-release) for release mechanics.

site/content/en/tools/_index.md

@@ -25,7 +25,7 @@ description = "Explore tools available on Envoy Gateway site"
         <p class="text-center mb-5 lead">
                 Our tools ecosystem is new and evolving and we welcome your contributions!<br/>
                 Get involved with the Envoy Gateway community and expand our tooling library.<br/>
-                Join us on <a href="https://communityinviter.com/apps/envoyproxy/envoy"><i class="fab fa-slack me-2"></i>Slack</a> and <a href="https://github.com/envoyproxy/gateway"> <i class="fab fa-github me-2"></i>GitHub</a>.
+                Join us on <a href="https://www.envoyproxy.io/slack"><i class="fab fa-slack me-2"></i>Slack</a> and <a href="https://github.com/envoyproxy/gateway"> <i class="fab fa-github me-2"></i>GitHub</a>.
         </p>
 
 </div>

site/content/en/tools/benchmark-report-explorer/index.md

@@ -38,7 +38,7 @@ includeBenchmark: true
   <p class="bt-description">
     Explore benchmark results from Envoy Gateway Releleases. The test code is open source and available for you to run and contribute to.
   </p>
-  <p class="bt-description">Curious to learn more? Join the conversation in <code>#gateway-users</code> channel in <a href="https://communityinviter.com/apps/envoyproxy/envoy">Envoy Slack</a></p>
+  <p class="bt-description">Curious to learn more? Join the conversation in <code>#gateway-users</code> channel in <a href="https://www.envoyproxy.io/slack">Envoy Slack</a></p>
 
   {{< benchmark-dashboard
     version="latest"

site/layouts/partials/footer.html

@@ -12,7 +12,7 @@ <h3>Envoy Ecosystem</h3>
       <div class="footer-column">
         <h3>Community</h3>
         <ul class="footer-links">
-          <li><a href="https://communityinviter.com/apps/envoyproxy/envoy">Join us on Slack <i class="fas fa-external-link-alt"></i></a></li>
+          <li><a href="https://www.envoyproxy.io/slack">Join us on Slack <i class="fas fa-external-link-alt"></i></a></li>
           <li><a href="https://docs.google.com/document/d/1i5wa1VsxIbQw7jbWvGmvy8C4Zpp7SGV1aVViSLgqU4M/edit?tab=t.0#heading=h.5229onpee4dg">Weekly Meetings <i class="fas fa-external-link-alt"></i></a></li>
           <li><a href="https://www.linkedin.com/company/envoy-cloud-native">LinkedIn <i class="fas fa-external-link-alt"></i></a></li>
         </ul>

tools/make/docs.mk

@@ -4,8 +4,11 @@ RELEASE_VERSIONS ?= $(foreach v,$(wildcard ${ROOT_DIR}/docs/*),$(notdir ${v}))
 #       find a way to remove github.com from ignore list
 # TODO: example.com is not a valid domain, we should remove it from ignore list
 # TODO: https://www.gnu.org/software/make became unstable, we should remove it from ignore list later
+# NOTE: envoyproxy.io/slack redirects to a Slack shared invite, and Slack answers 403 to
+#       automated clients, so the redirect target can't be verified by the link checker.
 LINKINATOR_IGNORE := "opentelemetry.io \
 	blog.envoyproxy.io \
+	envoyproxy.io/slack \
 	ntia.gov \
 	github.com \
 	jwt.io \