Update link to cpt-city (#8550)

doc/rst/source/grd2cpt.rst

@@ -59,7 +59,7 @@ z-values. These are the background color (B) assigned to values lower
 than the lowest *z*-value, the foreground color (F) assigned to values
 higher than the highest *z*-value, and the NaN color (N) painted
 wherever values are undefined.  For color tables beyond the
-current GMT offerings, visit `cpt-city <http://soliton.vm.bytemark.co.uk/pub/cpt-city/>`_.
+current GMT offerings, visit `cpt-city <http://www.seaviewsensing.com/pub/cpt-city/>`_.
 
 If the master CPT includes B, F, and N entries, these will be
 copied into the new master file. If not, the parameters

doc/rst/source/makecpt.rst

@@ -47,7 +47,7 @@ You define an equidistant set of contour intervals or pass
 your own z-table or list, and create a new CPT based on an existing master (dynamic)
 CPT. The resulting CPT can be reversed relative to the master
 cpt, and can be made continuous or discrete.  For color tables beyond the
-current GMT offerings, visit `cpt-city <http://soliton.vm.bytemark.co.uk/pub/cpt-city/>`_.
+current GMT offerings, visit `cpt-city <http://www.seaviewsensing.com/pub/cpt-city/>`_.
 
 The CPT includes three additional colors beyond the range of
 z-values. These are the background color (B) assigned to values lower

doc/rst/source/reference/cpts.rst

@@ -72,7 +72,7 @@ Color maps can be selected in various of the GMT tools using **-C**\ [*section*/
    The 22 color maps from cmocean by Kristen M. Thyng supported by GMT.
 
 For additional color tables, visit
-`cpt-city <http://soliton.vm.bytemark.co.uk/pub/cpt-city/>`_ and
+`cpt-city <http://www.seaviewsensing.com/pub/cpt-city/>`_ and
 `Scientific Colour-Maps <http://www.fabiocrameri.ch/colourmaps.php>`_.
 
 Labeled and non-equidistant color legends