Fix links to ij.jar in Maven repositories

Author: ctrueden

README.md

@@ -29,8 +29,8 @@ To use ImageJ as a library in your [Maven] project, add the dependency:
 
 Where `1.53j` is the version of ImageJ you would like to use:
 
-* Versions up to 1.48q are [in the SciJava Maven repository](https://maven.scijava.org/content/repositories/releases/net/imagej/ij/).
-* Versions starting with 1.48r are [on Maven Central](https://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22net.imagej%22%20AND%20a%3A%22ij%22).
+* Versions up to 1.48q are [in the SciJava Maven repository](https://maven.scijava.org/#browse/search/generic=group.raw%3Dnet.imagej%20AND%20name.raw%3Dij).
+* Versions starting with 1.48r are [on Maven Central](https://central.sonatype.com/artifact/net.imagej/ij/versions).
 * Be aware that versions prior to 1.53k may not identically match the
   corresponding release tags here in this repository.