doc: Mention standalone releases and tags

Author: Flamefire

doc/main.dox

@@ -429,7 +429,10 @@ The meaning of a locale under POSIX and Windows platforms is different and has v
 
 \subsection standalone_version Standalone Version
 
-It is possible to use Nowide library without having the huge Boost project as a dependency. There is a standalone version that has all the functionality in the \c nowide namespace instead of \c boost::nowide. The example above would look like
+It is possible to use the Nowide library without having the huge Boost project as a dependency.
+There is a standalone version that has all the functionality in the \c nowide namespace instead of \c boost::nowide.
+
+The example above would look like this:
 
 \code
 #include <nowide/args.hpp>
@@ -469,5 +472,10 @@ The upstream sources can be found at GitHub: <a href="https://github.com/boostor
 You can download the latest sources there:
 
 - Standard Version: <a href="https://github.com/boostorg/nowide/archive/master.zip">nowide-master.zip</a>
+- Standalone Version: <a href="https://github.com/boostorg/nowide/archive/standalone.zip">nowide-standalone.zip</a> (automatically populated from the develop branch)
+
+See the <a href="https://github.com/boostorg/nowide/releases">Releases section on GitHub</a> for Downloads of tagged releases.
+Both the standard (Boost) and standalone sources can be downloaded there along with the HTML documentation in a separate archive.
+Tags for the standalone version are prefixed with "standalone-" so they can be fetched too.
 
 */