[doc] fixed external and internal links

This merge request is fixing the link issues in the documentation of beat. bug number 11 in the beat.docs.

doc/links.rst

@@ -28,4 +28,4 @@
 .. OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 .. OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-.. _Algorithms: https://www.idiap.ch/software/beat/docs/beat/docs/master/beat/algorithms.html
+.. _BEAT documentation: https://www.idiap.ch/software/beat/documentation
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