Remove SSH support

Author: pentschev

README.md

@@ -98,26 +98,6 @@ cmake --build . --target rrun
 ./tools/rrun -v -n 4 -g 0,1,2,3 ./benchmarks/bench_comm -C ucxx-bootstrap
 ```
 
-#### Multi-Node Usage (SSH)
-
-```bash
-# Create hostfile
-cat > hosts.txt << EOF
-node1 slots=8 gpus=0,1,2,3,4,5,6,7
-node2 slots=8 gpus=0,1,2,3,4,5,6,7
-EOF
-
-# Launch across multiple nodes
-./tools/rrun --hostfile hosts.txt \
-             -d /shared/nfs/coord \
-             ./benchmarks/bench_comm -C ucxx-bootstrap
-
-# With processes per node override
-./tools/rrun --hostfile hosts.txt --ppn 4 \
-             -d /shared/nfs/coord \
-             ./benchmarks/bench_comm -C ucxx-bootstrap
-```
-
 ## Algorithms
 ### Table Shuffle Service
 Example of a MPI program that uses the shuffler: