Move some images to images folder

[ect123]

There are several images that need to be moved to the folder where the images are stored:

docs/Geomatics-for-Environmental-Management-2022_files/figure-html/10-idw-4-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/10-ordinary-kriging-2-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/10-simple-kriging-7-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/10-simple-random-sampling-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/10-simple-random-sampling-2-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/10-stratified-random-sampling-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/10-stratified-random-sampling-2-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/10-universal-kriging-2-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/9-DEM-profile-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/9-MRVBF-DEM-profile-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/9-focal-function-raster-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/9-high-pass-function-raster-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/9-local-function-raster-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/9-low-pass-function-raster-1.png
docs/Geomatics-for-Environmental-Management-2022_files/figure-html/9-zonal-function-raster-1.png

Each one is referenced in the textbook at that path, so they will also need to be updated.

If these are being build each time the book is generated with Bookdown, then we will need to fix the function that plops them in that folder.