does some cleanup of the directory structure

contrib/pa/README.md

@@ -19,7 +19,7 @@ setenv CXX $COWAREHOME/SLS/linux/common/bin/g++
 cmake -S . -B build/PA -DCMAKE_BUILD_TYPE=Debug -DUSE_CWR_SYSTEMC=ON -DBUILD_SHARED_LIBS=ON \
     -DCODEGEN=OFF -DCMAKE_INSTALL_PREFIX=${TGFS_INSTALL_ROOT}
 cmake --build build/PA --target install -j16
-cd dbt-rise-tgc/contrib
+cd dbt-rise-tgc/contrib/pa
 # import the TGC core itself
 pct tgc_import_tb.tcl
 ```
@@ -37,7 +37,7 @@ export CXX=$COWAREHOME/SLS/linux/common/bin/g++
 cmake -S . -B build/PA -DCMAKE_BUILD_TYPE=Debug -DUSE_CWR_SYSTEMC=ON -DBUILD_SHARED_LIBS=ON \
     -DCODEGEN=OFF -DCMAKE_INSTALL_PREFIX=${TGFS_INSTALL_ROOT}
 cmake --build build/PA --target install -j16
-cd dbt-rise-tgc/contrib
+cd dbt-rise-tgc/contrib/pa
 # import the TGC core itself
 pct tgc_import_tb.tcl
 ```