Move Lander to script phase

Ensures that a build is marked as a failure if the landing page is not
deployed.

.travis.yml

@@ -10,7 +10,6 @@ before_install:
 script:
    # Compile PDF using containerized lsst-texmf
    - "docker run --rm -v `pwd`:/workspace -w /workspace lsstsqre/lsst-texmf:latest sh -c 'make'"
-after_success:
    # Deploy website. See https://github.com/lsst-sqre/lander for CLI options
    - "lander --pdf ${PRODUCT}.pdf --upload --lsstdoc ${PRODUCT}.tex --env=travis --ltd-product $PRODUCT --docushare-url $DOCUSHAREURL"
 env: