Top links extension point (#764)
Top links extension point (#764)

* Add top nav link extension point
jenkinsci/blueocean-plugin,kzantow/blueocean-plugin,alvarolobato/blueocean-plugin,alvarolobato/blueocean-plugin,jenkinsci/blueocean-plugin,ModuloM/blueocean-plugin,kzantow/blueocean-plugin,alvarolobato/blueocean-plugin,ModuloM/blueocean-plugin,alvarolobato/blueocean-plugin,ModuloM/blueocean-plugin,kzantow/blueocean-plugin,kzantow/blueocean-plugin,jenkinsci/blueocean-plugin,jenkinsci/blueocean-plugin,ModuloM/blueocean-plugin,jenkinsci/blueocean-plugin