Fixed Aladin thumbnail view generator instructions

Status Job ID Name Coverage
  Build
passed #551076
doctest

00:02:13

passed #551074
html

00:02:10

passed #551077
latexpdf

00:02:05

failed #551078
allowed to fail
linkcheck

00:02:17

passed #551079
spelling

00:02:12

manual #551075
allowed to fail manual
stop review
passed #551073
validate-voevents

00:00:26

 
Name Stage Failure
failed
linkcheck Build
(line  391) ok        https://healpy.readthedocs.io/en/stable/tutorial.html
(line 391) ok https://healpy.readthedocs.io/en/stable/generated/healpy.pixelfunc.ud_grade.html#healpy.pixelfunc.ud_grade
(line 16) ok https://healpix.jpl.nasa.gov/images/healpixGridRefinement.jpg
(line 26) ok https://docs.astropy.org/en/stable/index.html
(line 420) redirect https://doi.org/10.1111/j.1365-2966.2007.12297.x - permanently to https://academic.oup.com/mnras/article/381/2/865/1021805

build finished with problems, 1 warning.
WARNING: Not copying tabs assets! Not compatible with linkcheck builder
ERROR: Job failed: exit code 1