Remove references to discourse.joinmastodon.org (#17797)

Remove broken CODEOWNERS file

Add sponsor.joinmastodon.org to FUNDING.yml

.github/CODEOWNERS

-# CODEOWNERS for mastodon/mastodon
-
-# Translators
-# To add translator, copy these lines, replace `fr` with appropriate language code and replace `@żelipapą` with user's GitHub nickname preceded by `@` sign or e-mail address.
-# /app/javascript/mastodon/locales/fr.json @żelipapą
-# /app/views/user_mailer/*.fr.html.erb @żelipapą
-# /app/views/user_mailer/*.fr.text.erb @żelipapą
-# /config/locales/*.fr.yml @żelipapą
-# /config/locales/fr.yml @żelipapą
-
-# Polish
-/app/javascript/mastodon/locales/pl.json @m4sk1n
-/app/views/user_mailer/*.pl.html.erb @m4sk1n
-/app/views/user_mailer/*.pl.text.erb @m4sk1n
-/config/locales/*.pl.yml @m4sk1n
-/config/locales/pl.yml @m4sk1n
-
-# French
-/app/javascript/mastodon/locales/fr.json @aldarone
-/app/javascript/mastodon/locales/whitelist_fr.json @aldarone
-/app/views/user_mailer/*.fr.html.erb @aldarone
-/app/views/user_mailer/*.fr.text.erb @aldarone
-/config/locales/*.fr.yml @aldarone
-/config/locales/fr.yml @aldarone
-
-# Dutch
-/app/javascript/mastodon/locales/nl.json @jeroenpraat
-/app/javascript/mastodon/locales/whitelist_nl.json @jeroenpraat
-/app/views/user_mailer/*.nl.html.erb @jeroenpraat
-/app/views/user_mailer/*.nl.text.erb @jeroenpraat
-/config/locales/*.nl.yml @jeroenpraat
-/config/locales/nl.yml @jeroenpraat

.github/FUNDING.yml

 patreon: mastodon
 open_collective: mastodon
-github: [Gargron]
+custom: https://sponsor.joinmastodon.org

.github/ISSUE_TEMPLATE/2.feature_request.yml

 name: Feature Request
 description: I have a suggestion
+labels: suggestion
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/3.support.md

----
-name: Support
-about: Ask for help with your deployment
-title: DO NOT CREATE THIS ISSUE
----
-
-We primarily use GitHub as a bug and feature tracker. For usage questions, troubleshooting of deployments and other individual technical assistance, please use one of the resources below:
-
-- https://discourse.joinmastodon.org
-- #mastodon on irc.freenode.net

.github/ISSUE_TEMPLATE/config.yml

 blank_issues_enabled: false
 contact_links:
-  - name: Mastodon Meta Discussion Board
-    url: https://discourse.joinmastodon.org/
+  - name: GitHub Discussions
+    url: https://github.com/mastodon/mastodon/discussions
     about: Please ask and answer questions here.
+  - name: Bug Bounty Program
+    url: https://app.intigriti.com/programs/mastodon/mastodonio/detail
+    about: Please report security vulnerabilities here.

SECURITY.md

 # Security Policy
 
+If you believe you've identified a security vulnerability in Mastodon (a bug that allows something to happen that shouldn't be possible), you should submit the report through our [Bug Bounty Program][bug-bounty]. Alternatively, you can reach us at <hello@joinmastodon.org>.
+
+You should *not* report such issues on GitHub or in other public spaces to give us time to publish a fix for the issue without exposing Mastodon's users to increased risk.
+
+## Scope
+
+A "vulnerability in Mastodon" is a vulnerability in the code distributed through our main source code repository on GitHub. Vulnerabilities that are specific to a given installation (e.g. misconfiguration) should be reported to the owner of that installation and not us.
+
 ## Supported Versions
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 3.4.x   | :white_check_mark: |
-| 3.3.x   | :white_check_mark: |
-| < 3.3   | :x:                |
-
-## Reporting a Vulnerability
+| 3.4.x   | Yes                |
+| 3.3.x   | Yes                |
+| < 3.3   | No                 |
 
-hello@joinmastodon.org
+[bug-bounty]: https://app.intigriti.com/programs/mastodon/mastodonio/detail