Documentation: Add note in README.md about current binary releases via GitHub Actions

[hrpv]

Summary

The README.md currently only describes how to manually build RcloneBrowser from source using a local toolchain (Qt, CMake, Visual Studio / GCC).

However, many users just want to download the latest compiled binaries for their platform without setting up a full local build environment.

Problem

When visiting the repository, most users naturally click on the "Latest Release" tag on the right sidebar (currently showing Rclone Browser 2.0.0 Beta, which is ~3 years old). They might miss the fact that actively maintained, up-to-date binaries are automatically built with every update via GitHub Actions workflow (.github/workflows/build.yml).

Proposed Solution / Suggestion

It would be very helpful to add a short section or note to the top/download section of README.md pointing users to:

1. GitHub Releases: Mentioning that modern build releases (generated via GitHub Actions) are available under the Releases page (e.g., tags like release-XXXXXXX).
2. Fork / Action Builds: Briefly explaining that users can also fork the repo and build/download binaries directly via GitHub Actions (Actions tab) without a local compiler setup.

Thanks for your continuous work on keeping RcloneBrowser updated!