[MNGSITE-393] Remove references to Maven 2.x

**[Elliotte Rusty Harold](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=elharo)** opened **[MNGSITE-393](https://issues.apache.org/jira/browse/MNGSITE-393?redirect=false)** and commented

Maven 3.x is over a decade old now and we're talking about Maven 4. It's time to clean out all the random discussion here and there about how Maven 2.x did things, differences between Maven 2 and 3, what works in Maven 3 but not 2, etc.

Assume Maven 3.0 as the minimum, probably Maven 3.1.

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**Attachments:**
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**Issue Links:**
- [MNGSITE-440](https://issues.apache.org/jira/browse/MNGSITE-440) Report plugin not configured correctly according to documentation

**Remote Links:**
- [GitHub Pull Request #5
](https://github.com/apache/maven-antrun-plugin/pull/5)
- [GitHub Pull Request #21
](https://github.com/apache/maven-apache-parent/pull/21)
- [GitHub Pull Request #12
](https://github.com/apache/maven-artifact-transfer/pull/12)
- [GitHub Pull Request #35
](https://github.com/apache/maven-compiler-plugin/pull/35)
- [GitHub Pull Request #440
](https://github.com/apache/maven-dependency-plugin/pull/440)
- [GitHub Pull Request #52
](https://github.com/apache/maven-dependency-plugin/pull/52)
- [GitHub Pull Request #2
](https://github.com/apache/maven-doxia-site/pull/2)
- [GitHub Pull Request #20
](https://github.com/apache/maven-doxia/pull/20)
- [GitHub Pull Request #5
](https://github.com/apache/maven-gpg-plugin/pull/5)
- [GitHub Pull Request #8
](https://github.com/apache/maven-jar-plugin/pull/8)
- [GitHub Pull Request #25
](https://github.com/apache/maven-jxr/pull/25)
- [GitHub Pull Request #24
](https://github.com/apache/maven-plugin-tools/pull/24)
- [GitHub Pull Request #2
](https://github.com/apache/maven-reporting-impl/pull/2)
- [GitHub Pull Request #116
](https://github.com/apache/maven-scm/pull/116)
- [GitHub Pull Request #20
](https://github.com/apache/maven-site-plugin/pull/20)
- [GitHub Pull Request #30
](https://github.com/apache/maven-site-plugin/pull/30)
- [GitHub Pull Request #144
](https://github.com/apache/maven-site/pull/144)
- [GitHub Pull Request #145
](https://github.com/apache/maven-site/pull/145)
- [GitHub Pull Request #146
](https://github.com/apache/maven-site/pull/146)
- [GitHub Pull Request #152
](https://github.com/apache/maven-site/pull/152)
- [GitHub Pull Request #154
](https://github.com/apache/maven-site/pull/154)
- [GitHub Pull Request #156
](https://github.com/apache/maven-site/pull/156)
- [GitHub Pull Request #160
](https://github.com/apache/maven-site/pull/160)
- [GitHub Pull Request #161
](https://github.com/apache/maven-site/pull/161)
- [GitHub Pull Request #162
](https://github.com/apache/maven-site/pull/162)
- [GitHub Pull Request #169
](https://github.com/apache/maven-site/pull/169)
- [GitHub Pull Request #170
](https://github.com/apache/maven-site/pull/170)
- [GitHub Pull Request #174
](https://github.com/apache/maven-site/pull/174)
- [GitHub Pull Request #212
](https://github.com/apache/maven-site/pull/212)
- [GitHub Pull Request #239
](https://github.com/apache/maven-site/pull/239)
- [GitHub Pull Request #266
](https://github.com/apache/maven-site/pull/266)
- [GitHub Pull Request #446
](https://github.com/apache/maven-site/pull/446)
- [GitHub Pull Request #447
](https://github.com/apache/maven-site/pull/447)
- [GitHub Pull Request #454
](https://github.com/apache/maven-site/pull/454)
- [GitHub Pull Request #533
](https://github.com/apache/maven-site/pull/533)
- [GitHub Pull Request #534
](https://github.com/apache/maven-site/pull/534)
- [GitHub Pull Request #565
](https://github.com/apache/maven-site/pull/565)
- [GitHub Pull Request #567
](https://github.com/apache/maven-site/pull/567)
- [GitHub Pull Request #608
](https://github.com/apache/maven-site/pull/608)
- [GitHub Pull Request #635
](https://github.com/apache/maven-site/pull/635)
- [GitHub Pull Request #664
](https://github.com/apache/maven-site/pull/664)
- [GitHub Pull Request #667
](https://github.com/apache/maven-site/pull/667)
- [GitHub Pull Request #647
](https://github.com/apache/maven-surefire/pull/647)
- [GitHub Pull Request #2024
](https://github.com/apache/maven/pull/2024)
- [GitHub Pull Request #2276
](https://github.com/apache/maven/pull/2276)
- [GitHub Pull Request #2438
](https://github.com/apache/maven/pull/2438)

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