Replace expired Slack invite with Fleet website slack redirect (#15747)

Related to: https://github.com/fleetdm/fleet/issues/15089

Changes:
- Replaced the expired osquery Slack invitation with a link to the Fleet
website's `/slack` redirect.

---------

Co-authored-by: Mike McNeil <mikermcneil@users.noreply.github.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -1,7 +1,7 @@
 blank_issues_enabled: false
 contact_links:
-  - name: Chat with other developers
-    url: https://osquery.slack.com/join/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw#/
+  - name: Chat with other users
+    url: https://fleetdm.com/support
     about: Please ask and answer questions here.
   - name: Documentation
     url: https://fleetdm.com/documentation

frontend/pages/errors/Fleet404/Fleet404.tsx

@@ -39,7 +39,7 @@ const Fleet404 = () => (
       </p>
       <div className={`${baseClass}__button-wrapper`}>
         <a
-          href="https://osquery.slack.com/join/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw#/"
+          href="https://fleetdm.com/support"
           target="_blank"
           rel="noopener noreferrer"
         >

frontend/pages/errors/Fleet500/Fleet500.tsx

@@ -36,7 +36,7 @@ const Fleet500 = () => (
       <p>Please file an issue if you believe this is a bug.</p>
       <div className={`${baseClass}__button-wrapper`}>
         <a
-          href="https://osquery.slack.com/join/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw#/"
+          href="https://fleetdm.com/support"
           target="_blank"
           rel="noopener noreferrer"
         >

handbook/company/communications.md

@@ -1369,7 +1369,7 @@ TODO: Document.
 
 #### Tracking
 
-When responding to a question or issue in the [#fleet](https://osquery.slack.com/join/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw#/) channel of the osquery Slack workspace, push the thread to Zapier using the `TODO: Update docs` Zap. This will add information about the thread to the [Slack Questions Spreadsheet](https://docs.google.com/spreadsheets/d/15AgmjlnV4oRW5m94N5q7DjeBBix8MANV9XLWRktMDGE/edit#gid=336721544). In the `Notes` field, you can include any information that you think will be helpful when making weekly doc updates. That may be something like
+When responding to a question or issue in the [#fleet channel of the osquery Slack workspace](https://fleetdm.com/slack), push the thread to Zapier using the `TODO: Update docs` Zap. This will add information about the thread to the [Slack Questions Spreadsheet](https://docs.google.com/spreadsheets/d/15AgmjlnV4oRW5m94N5q7DjeBBix8MANV9XLWRktMDGE/edit#gid=336721544). In the `Notes` field, you can include any information that you think will be helpful when making weekly doc updates. That may be something like
 
 - proposed change to the documentation.
 - documentation link that was sent as a response.

server/mail/templates/change_email_confirmation.html

@@ -151,7 +151,7 @@
                     />
                   </a>
                   <a
-                    href="https://osquery.slack.com/join/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw#/"
+                    href="https://fleetdm.com/support"
                     target="_blank"
                   >
                     <img

server/mail/templates/invite_token.html

@@ -181,7 +181,7 @@
                     />
                   </a>
                   <a
-                    href="https://osquery.slack.com/join/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw#/"
+                    href="https://fleetdm.com/support"
                     target="_blank"
                   >
                     <img

server/mail/templates/password_reset.html

@@ -156,7 +156,7 @@
                     />
                   </a>
                   <a
-                    href="https://osquery.slack.com/join/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw#/"
+                    href="https://fleetdm.com/support"
                     target="_blank"
                   >
                     <img

server/mail/templates/smtp_setup.html

@@ -130,7 +130,7 @@
                     />
                   </a>
                   <a
-                    href="https://osquery.slack.com/join/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw#/"
+                    href="https://fleetdm.com/support"
                     target="_blank"
                   >
                     <img

website/config/routes.js

@@ -484,7 +484,7 @@ module.exports.routes = {
   'GET /terms':                      '/legal/terms',
   'GET /handbook/security/github':   '/handbook/security#git-hub-security',
   'GET /login':                      '/customers/login',
-  'GET /slack':                      'https://join.slack.com/t/osquery/shared_invite/zt-1wkw5fzba-lWEyke60sjV6C4cdinFA1w',
+  'GET /slack':                      'https://join.slack.com/t/osquery/shared_invite/zt-1wkw5fzba-lWEyke60sjV6C4cdinFA1w',// Note: This redirect is used on error pages and email templates in the Fleet UI.
   'GET /docs/using-fleet/updating-fleet': '/docs/deploying/upgrading-fleet',
   'GET /blog':                   '/articles',
   'GET /brand':                  '/logos',