Update: project subtitle

Author: heptaflar

CITATION.cff

@@ -25,4 +25,4 @@ repository-code: >-
 url: >-
   https://bcdev.github.io/kaleidoscope/
 abstract: >-
-  Monte Carlo simulation of errors for ESA SCOPE.
+  Monte Carlo uncertainty propagation for ESA SCOPE.

README.md

@@ -1,6 +1,6 @@
 # ![Kaleidoscope](/assets/img/kaleidoscope.png)
 
-Monte Carlo simulation of errors for [ESA SCOPE](https://oceancarbon-scope.org).
+Monte Carlo uncertainty propagation for [ESA SCOPE](https://oceancarbon-scope.org).
 
 ## Installing and testing