smolnes.elf cannot be executed and no "inferior exit code 0" output to indicate that a process has completed in the rv32emu-demo

[ChinYikMing]

The spelling of smolnes.elf is incorrect in "assets/html/index.html".

Output "inferior exit code 0" by rv32emu is necessary for telling the user whether the process is still running but it lacks in rv32emu-demo.