Convert the remaining xdoc pages to Markdown

src/site/markdown/get-involved.md

@@ -0,0 +1,64 @@
+---
+title: Getting Involved
+author: 
+  - Rahul Thakur
+  - Olivier Lamy
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# Getting Involved
+
+Contributions are welcome. The full guide lives with the code: [CONTRIBUTING.md](https://github.com/codehaus-plexus/.github/blob/master/CONTRIBUTING.md). The short version is below. 
+
+## Where to ask
+
+[GitHub issues](https://github.com/codehaus-plexus), on the repository concerned. That is where the maintainers are. There is no Plexus mailing list — if you find one referenced in older documentation on this site, it is defunct. 
+
+Each project on the [overview page](./index.html) links to its own repository. If you aren't sure which one owns the behaviour you're seeing, open the issue wherever seems closest and we'll move it. 
+
+## Building
+
+`mvn verify`. No profile or local setup is required. CI builds across JDK 8, 21 and 25 on Linux, Windows and macOS. 
+
+## Code style
+
+Formatting is enforced by the build, via [Spotless](https://github.com/diffplug/spotless) and [palantir-java-format](https://github.com/palantir/palantir-java-format). Don't hand-format, and don't reformat code you aren't otherwise touching. Before pushing: 
+
+```unknown
+mvn spotless:apply
+```
+
+If CI fails on `spotless:check`, running that command and committing the result is the whole fix. 
+
+This page previously offered `maven-eclipse-codestyle.xml` and `maven-idea-codestyle.xml` for import into your IDE. Those predate Spotless and no longer match what the build enforces, so they are no longer linked from here. The files themselves are still served, so any existing link to them keeps working. 
+
+## Licence headers
+
+New files take the standard header used by the files around them — Apache-2.0 for everything except Modello, which is MIT. Please do not update or normalise existing copyright headers, including the older Codehaus Foundation ones; they record who contributed what. 
+
+## Pull requests
+
+One concern per pull request, a test where the change is testable, and an explanation of _why_ in the description. These libraries are consumed transitively across most of the Maven plugin ecosystem, so changes to public API need discussion in an issue first — deprecate rather than remove. 
+
+## Security
+
+Please do not open a public issue for a vulnerability. See [SECURITY.md](https://github.com/codehaus-plexus/.github/blob/master/SECURITY.md). 
+

src/site/markdown/ref/available-components.md

@@ -0,0 +1,34 @@
+---
+title: Available Plexus Components
+author: 
+  - Rahul Thakur
+  - Olivier Lamy
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# Available Plexus Components
+
+**This page is out of date and is kept only so existing links to it keep working.** 
+
+The current list of Plexus libraries and components, with links to their sites, is on the [overview page](../index.html). 
+
+The list that used to be here described the components as they stood when Plexus was still an IoC container. Most of what it advertised no longer exists in any form — `plexus-cli`, `plexus-spring`, `plexus-contextualizer`, `plexus-xwork-integration`, `plexus-mail-sender`, `plexus-cache` and `plexus-swizzle` are all gone or archived — and it listed none of the components that are actually maintained today. Rather than leave that standing, the content has been removed and the overview page is now the single index. 
+