docs: fixes DOC-38

[melissahenderson]

Description of changes

• Created a new Overview page in the Integration section that contains information from the Simple Rafiki Integration Guide blog post: https://deploy-preview-3879--brilliant-pasca-3e80ec.netlify.app/integration/overview/
• Updated the Integration Requirements Checklist page (fka "Overview and checklist") because it contained a lot of the same information as the new Overview page: https://deploy-preview-3879--brilliant-pasca-3e80ec.netlify.app/integration/requirements/overview/
• Added a modified image from the blog post to the concepts ASE page, and updated the page's content to more closely match what's shown in the image: https://deploy-preview-3879--brilliant-pasca-3e80ec.netlify.app/overview/concepts/account-servicing-entity/
• Added "Asset" to the glossary
• Updated a few random pages for formatting and Vale

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🚀 Performance Test Results

Test Configuration:

• VUs: 4
• Duration: 1m0s

Test Metrics:

• Requests/s: 49.36
• Iterations/s: 16.45
• Failed Requests: 0.00% (0 of 2968)

📜 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..................: 1.1 MB 18 kB/s
     data_sent......................: 2.3 MB 38 kB/s
     http_req_blocked...............: avg=6µs     min=1.98µs   med=4.93µs   max=414.55µs p(90)=6.21µs   p(95)=6.78µs  
     http_req_connecting............: avg=298ns   min=0s       med=0s       max=344.33µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=80.45ms min=7.49ms   med=64.75ms  max=406.17ms p(90)=138.08ms p(95)=161.51ms
       { expected_response:true }...: avg=80.45ms min=7.49ms   med=64.75ms  max=406.17ms p(90)=138.08ms p(95)=161.51ms
     http_req_failed................: 0.00%  ✓ 0         ✗ 2968
     http_req_receiving.............: avg=84.72µs min=23.83µs  med=75.51µs  max=1.2ms    p(90)=111.63µs p(95)=139.86µs
     http_req_sending...............: avg=35.19µs min=8.58µs   med=27.51µs  max=2.45ms   p(90)=40.7µs   p(95)=58.79µs 
     http_req_tls_handshaking.......: avg=0s      min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=80.33ms min=7.34ms   med=64.65ms  max=406.07ms p(90)=137.94ms p(95)=161.39ms
     http_reqs......................: 2968   49.359937/s
     iteration_duration.............: avg=243ms   min=149.58ms med=228.64ms max=843.82ms p(90)=303.34ms p(95)=334.12ms
     iterations.....................: 989    16.447769/s
     vus............................: 4      min=4       max=4 
     vus_max........................: 4      min=4       max=4 

[mkurapov]

Should we make this a bit different visually? Or move it up to the top of the section, before the CardGrid under this heading?

[melissahenderson]

I've made it the first card in the grid and added a checkmark icon. Let me know what you think. I'd like to change the icon color from yellow, but Starlight doesn't have a way to do that without throwing manual CSS somewhere.