Fix cmake config file install path (#37)

10 jobs for 39-docs-for-tikhonov-and-block-stuff-missing in 5 minutes and 9 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Static Test
passed clang-format #816673
clang elsa linux

00:00:16

passed clang-tidy #816674
clang elsa linux

00:00:24

 
  Compile
passed build-clang8 #816677
clang elsa linux

00:00:42

passed build-cuda92 #816678
cuda gcc elsa linux

00:00:52

passed build-gcc9 #816676
gcc elsa linux

00:00:49

passed build-ubuntu #816675
elsa linux

00:00:18

 
  Test
passed test-clang8 #816681
clang elsa linux

00:03:25

passed test-cuda92 #816682
cuda gcc elsa linux

00:03:50

passed test-gcc9 #816680
gcc elsa linux

00:03:51

passed test-ubuntu #816679
elsa linux

00:03:35