added seperate script files for building and running docker image

build.ps1

+# remove previous image
+docker image rm schdesign/roadmap:mkdocs-material
+
+# build docker image
+docker build -t schdesign/roadmap:mkdocs-material .

run.ps1

+# start docker image
+docker run --rm -it -p 8000:8000 -v ${PWD}:/docs schdesign/roadmap:mkdocs-material