Consolidate the two pages about Maven classloading

[kwin]

Improvement proposal

We have both

• https://maven.apache.org/guides/mini/guide-maven-classloading.html (https://github.com/apache/maven-site/blob/master/content/markdown/guides/mini/guide-maven-classloading.md) and
• https://svn.apache.org/repos/infra/websites/production/maven/content/reference/maven-classloading.html (https://github.com/apache/maven-site/blob/master/content/markdown/reference/maven-classloading.md)

The latter cannot be accessed via https://maven.apache.org/ due to this redirect rule:

maven-site/content/filtered-resources/.htaccess

Line 31 in d0537a9

RedirectMatch ^/reference/(.*)$ /archives/maven-1.x/reference/$1

The latter should therefore be removed and relevant parts merged into the former.

[BHARGAV-RUE]

Hi, I'd like to work on this issue. Could you please assign it to me?

[BHARGAV-RUE]

The current reference is being identified as folder not as .md file.

content/markdown/reference/
├── maven-classloading.md
├── maven-classloading.odg
└── maven-classloading.png

I was thinking of deleting the reference folder and add the image into content/resource/images/ and combine the reference folder's maven-classloading.md with guide-maven-classloading.md

I'd like to follow the project's preferred documentation layout before submitting the PR.