remove old build instructions

_lessons/time_integrators_sundials/lesson.md

@@ -35,19 +35,7 @@ header:
    ```
 
 If you want to modify and rebuild the hands-on codes, the source files are
-located under `track-5-numerical/time_integration_sundials/SUNDIALS+AMReX` and
-can be compiled by starting an interactive session on ThetaGPU and using the
-provided configuration script to build on the compute node:
-```
-module load openmpi/openmpi-4.1.4_ucx-1.12.1_gcc-9.4.0
-module load aocl/blis/blis-3.2
-module load aocl/libflame/libflame-3.2
-module load cmake-3.20.3-gcc-9.3.0-57eqw4f
-
-./config_atpesc_thetagpu.sh
-cd build
-make -j
-```
+located under `track-5-numerical/time_integration_sundials/SUNDIALS+AMReX`.
 
 The entire set of hands-on lesson codes is also available on
 [GitHub](https://github.com/AMReX-Codes/ATPESC-codes), under the