update maintenance and readme (#108)

<!--
This is just a proposal for our updated maintenance file with ideas how we could keep responsibility for the repo from local-it.
-->

* [ ] I have deployed and tested my changes
* [ ] I have [updated relevant versions in `abra.sh`](https://docs.coopcloud.tech/maintainers/upgrade/#updating-versions-in-the-abrash)
* [ ] I have made my environment variable changes [backwards compatible](https://docs.coopcloud.tech/maintainers/upgrade/#backwards-compatible-environment-variable-changes)
* [ ] I have added a [release note entry](https://docs.coopcloud.tech/maintainers/upgrade/#creating-new-release-notes)

Reviewed-on: #108
Reviewed-by: p4u1 <p4u1@noreply.git.coopcloud.tech>
Reviewed-by: decentral1se <decentral1se@noreply.git.coopcloud.tech>
Co-authored-by: carla <carla@local-it.org>
Co-committed-by: carla <carla@local-it.org>

MAINTENANCE.md

@@ -7,10 +7,9 @@ certain quality and consistency, that others can rely on.
 
 A recipe maintainer has the following responsibilities:
 
-- Respond to pull requests / issues within a week
-- Make image security updates within a day
-- Make image patch / minor updates within a week
-- Make image major updates within a month
+- Respond to pull requests / issues within two weeks
+- Make image security updates within a week
+- Make image major updates every three months
 
 In order to fullfill these responsibilities a recipe maintainer:
 

README.md

@@ -5,7 +5,7 @@
 > https://docs.traefik.io
 
 <!-- metadata -->
-* **Maintainer**: [@p4u1](https://git.coopcloud.tech/p4u1), [@decentral1se](https://git.coopcloud.tech/decentral1se), [@javielico](https://git.coopcloud.tech/javielico), [@moritz](https://git.coopcloud.tech/moritz)
+* **Maintainer**: [@p4u1](https://git.coopcloud.tech/p4u1), [@decentral1se](https://git.coopcloud.tech/decentral1se), [@javielico](https://git.coopcloud.tech/javielico), Local-IT: [@moritz](https://git.coopcloud.tech/moritz), [@msimon](https://git.coopcloud.tech/simon), [@carla](https://git.coopcloud.tech/carla)
 * **Status**: `stable`
 * **Category**: Utilities
 * **Features**: ?
@@ -42,8 +42,8 @@ subdomains, like
 need to give Traefik access to your DNS provider so that it can carry out
 Letsencrypt DNS challenges.
 
-1. Use Gandi, OVH, DO, Azure, PorkBun, or Cloudflare for DNS 🤡 (support for
-   other providers can be easily added, see
+1. Use Gandi, OVH, DO, Azure, or PorkBun for DNS 🤡 (support for other providers
+   can be easily added, see
    [the `lego` docs](https://go-acme.github.io/lego/dns/#dns-providers).
 2. Run `abra app config YOURAPPDOMAIN`
 3. Uncomment e.g. `ENABLE_GANDI` and the related `SECRET_.._VERSION` line, e.g.