docs: change theme to teal

[melissahenderson]

Changed Rafiki doc theme color from orange to teal. Closes doc-design-system issue 36.

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🚀 Performance Test Results

Test Configuration:

• VUs: 4
• Duration: 1m0s

Test Metrics:

• Requests/s: 41.68
• Iterations/s: 13.91
• Failed Requests: 0.00% (0 of 2505)

📜 Logs

> performance@1.0.0 run-tests:testenv /home/runner/work/rafiki/rafiki/test/performance
> ./scripts/run-tests.sh -e test "-k" "-q" "--vus" "4" "--duration" "1m"

Cloud Nine GraphQL API is up: http://localhost:3101/graphql
Cloud Nine Wallet Address is up: http://localhost:3100/
Happy Life Bank Address is up: http://localhost:4100/
cloud-nine-wallet-test-backend already set
cloud-nine-wallet-test-auth already set
happy-life-bank-test-backend already set
happy-life-bank-test-auth already set
     data_received..................: 873 kB 15 kB/s
     data_sent......................: 1.8 MB 30 kB/s
     http_req_blocked...............: avg=7.2µs    min=2.42µs   med=5.37µs   max=895.36µs p(90)=6.32µs   p(95)=6.82µs  
     http_req_connecting............: avg=1.05µs   min=0s       med=0s       max=792.61µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=95.33ms  min=10.53ms  med=80.51ms  max=575.9ms  p(90)=159.06ms p(95)=188.08ms
       { expected_response:true }...: avg=95.33ms  min=10.53ms  med=80.51ms  max=575.9ms  p(90)=159.06ms p(95)=188.08ms
     http_req_failed................: 0.00%  ✓ 0         ✗ 2505
     http_req_receiving.............: avg=91.32µs  min=25µs     med=81.45µs  max=1.2ms    p(90)=117.91µs p(95)=145.53µs
     http_req_sending...............: avg=37.73µs  min=10.67µs  med=28.86µs  max=2.78ms   p(90)=40.86µs  p(95)=53.88µs 
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=95.2ms   min=10.33ms  med=80.41ms  max=575.77ms p(90)=158.94ms p(95)=187.96ms
     http_reqs......................: 2505   41.677349/s
     iteration_duration.............: avg=287.33ms min=199.59ms med=270.91ms max=1.13s    p(90)=356.62ms p(95)=388.64ms
     iterations.....................: 836    13.909087/s
     vus............................: 4      min=4       max=4 
     vus_max........................: 4      min=4       max=4