This commit updates the README file to include additional instructions for loading ZIM files and accessing articles in the Kiwix content archive using the `java-libkiwix` library.
Changes made in the README:
- Added a section explaining how to load a ZIM file by creating an `Archive` object.
- Clarified the description of the `mainPage` property, detailing its behavior when dealing with redirects and non-existent entries.
- Provided code snippets and instructions for loading articles via title and path, including a reminder to properly decode the URL path before passing it to `hasEntryByPath`.
These changes aim to improve the documentation and assist developers in effectively utilizing the `java-kibkiwix` library to work with zim files.
* Updated the source of libkiwix and libzim .so files to download.kiwix.org/release instead of using nightly builds.
* Introduced new variables for specifying the versions of libkiwix and libzim, allowing retrieval of .so files from the release repositories.
* Modified the README.md file to get the version and image from maven central for `org.kiwix.libkiwix` artifact.
