docs: add instructions for wasm building

[YassinEldeeb]

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[github-actions]

✅ Benchmark Results

     data_received..................: 62 MB   780 kB/s
     data_sent......................: 99 MB   1.2 MB/s
     http_req_blocked...............: avg=2.25µs  min=752ns    med=1.91µs  max=12.22ms  p(90)=2.18µs  p(95)=2.38µs 
     http_req_connecting............: avg=119ns   min=0s       med=0s      max=12.13ms  p(90)=0s      p(95)=0s     
   ✓ http_req_duration..............: avg=27.17ms min=782.72µs med=26.6ms  max=113.05ms p(90)=44.05ms p(95)=50.65ms
       { expected_response:true }...: avg=27.17ms min=782.72µs med=26.6ms  max=113.05ms p(90)=44.05ms p(95)=50.65ms
   ✓ http_req_failed................: 0.00%   ✓ 0           ✗ 256740
     http_req_receiving.............: avg=33.13µs min=9.15µs   med=25.23µs max=28.99ms  p(90)=37.43µs p(95)=41.26µs
     http_req_sending...............: avg=16.94µs min=4.76µs   med=11µs    max=56.78ms  p(90)=13.1µs  p(95)=21.1µs 
     http_req_tls_handshaking.......: avg=0s      min=0s       med=0s      max=0s       p(90)=0s      p(95)=0s     
     http_req_waiting...............: avg=27.12ms min=750.31µs med=26.55ms max=113.02ms p(90)=43.98ms p(95)=50.58ms
     http_reqs......................: 256740  3209.228075/s
     iteration_duration.............: avg=27.27ms min=859.03µs med=26.69ms max=113.13ms p(90)=44.15ms p(95)=50.75ms
     iterations.....................: 256740  3209.228075/s
   ✓ valid_graphql_response.........: 100.00% ✓ 256740      ✗ 0     
   ✓ valid_http_code................: 100.00% ✓ 256740      ✗ 0     
     vus............................: 1       min=1         max=100 
     vus_max........................: 100     min=100       max=100