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: 51.88
• Iterations/s: 17.30
• Failed Requests: 0.00% (0 of 3119)

📜 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 19 kB/s
     data_sent......................: 2.4 MB 40 kB/s
     http_req_blocked...............: avg=7.28µs   min=2.51µs   med=5.07µs   max=1.05ms   p(90)=6.22µs   p(95)=6.76µs  
     http_req_connecting............: avg=780ns    min=0s       med=0s       max=902.22µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=76.51ms  min=6.3ms    med=62.4ms   max=370.33ms p(90)=127.28ms p(95)=151.61ms
       { expected_response:true }...: avg=76.51ms  min=6.3ms    med=62.4ms   max=370.33ms p(90)=127.28ms p(95)=151.61ms
     http_req_failed................: 0.00%  ✓ 0         ✗ 3119
     http_req_receiving.............: avg=83.85µs  min=23.28µs  med=72.65µs  max=3.21ms   p(90)=107.2µs  p(95)=140.34µs
     http_req_sending...............: avg=33.83µs  min=11µs     med=27.36µs  max=1.08ms   p(90)=38.88µs  p(95)=49.65µs 
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=76.39ms  min=6ms      med=62.33ms  max=370.09ms p(90)=127.17ms p(95)=151.52ms
     http_reqs......................: 3119   51.882926/s
     iteration_duration.............: avg=231.03ms min=138.74ms med=220.18ms max=801.43ms p(90)=285.19ms p(95)=312.55ms
     iterations.....................: 1040   17.299853/s
     vus............................: 4      min=4       max=4 
     vus_max........................: 4      min=4       max=4