feat: landing page

[n1ru4l]

The landing page is shown on a 404.
The landing page can be disabled by passing landingPage: false to createYoga.

---

Closes #1353

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✅ Benchmark Results

     ✓ no_errors
     ✓ expected_result

     checks.........................: 100.00% ✓ 139314      ✗ 0    
     data_received..................: 19 MB   618 kB/s
     data_sent......................: 8.0 MB  267 kB/s
     http_req_blocked...............: avg=1.55µs   min=1µs      med=1.3µs    max=926.85µs p(90)=1.9µs    p(95)=2.4µs   
     http_req_connecting............: avg=1ns      min=0s       med=0s       max=122µs    p(90)=0s       p(95)=0s      
   ✓ http_req_duration..............: avg=333.71µs min=190.01µs med=276.41µs max=22.32ms  p(90)=384.22µs p(95)=485.44µs
       { expected_response:true }...: avg=333.71µs min=190.01µs med=276.41µs max=22.32ms  p(90)=384.22µs p(95)=485.44µs
     http_req_failed................: 0.00%   ✓ 0           ✗ 69657
     http_req_receiving.............: avg=25.58µs  min=13.2µs   med=21.8µs   max=6.25ms   p(90)=30.9µs   p(95)=36µs    
     http_req_sending...............: avg=10.84µs  min=4.6µs    med=8.3µs    max=2.74ms   p(90)=13.6µs   p(95)=14.7µs  
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=297.28µs min=167.9µs  med=244.21µs max=22.17ms  p(90)=342.91µs p(95)=432.44µs
     http_reqs......................: 69657   2321.793176/s
     iteration_duration.............: avg=424.55µs min=250.81µs med=360.82µs max=22.94ms  p(90)=491.42µs p(95)=608.83µs
     iterations.....................: 69657   2321.793176/s
     vus............................: 1       min=1         max=1  
     vus_max........................: 1       min=1         max=1