Import the Mattermost bot logo as a module

Closes #50827
Closes #50826

This allows us to create a download link using the `a` tag.

Depends on gravitational/docs-website#114

docs/pages/admin-guides/access-controls/access-request-plugins/ssh-approval-mattermost.mdx

@@ -3,6 +3,8 @@ title: Run the Mattermost Access Request plugin
 description: How to set up Teleport's Mattermost plugin for privilege elevation approvals.
 ---
 
+import BotLogo from "/static/avatar_logo.png";
+
 This guide explains how to integrate Teleport Access Requests with Mattermost, an open 
 source messaging platform. The Teleport Mattermost plugin notifies individuals of
 Access Requests. Users can then approve and deny Access Requests by following the
@@ -101,8 +103,8 @@ Set the "Username", "Display Name", and "Description" fields according to how
 you would like the Mattermost plugin bot to appear in your workspace. Set "Role"
 to "Member".
 
-You can [download](../../../../img/enterprise/plugins/[email protected]) our
-avatar to set as your Bot Icon.
+You can <a href={BotLogo} download>download</a> our avatar to set as your Bot
+Icon.
 
 Set "post:all" to "Enabled".