docs(readme): fix @opentelemetry/instrumentation-http link

[hongbo-miao]

1. @opentelemetry/instrumentation-http was pointing to old plugin link.
2. We actually don't have @opentelemetry/instrumentation-https because new @opentelemetry/instrumentation-http will handle both HTTP and HTTPs, so remove that not used link.

[codecov]

Codecov Report

Merging #1973 (e63d7de) into main (67f7e70) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1973      +/-   ##
==========================================
- Coverage   92.90%   92.78%   -0.13%     
==========================================
  Files         152      147       -5     
  Lines        5922     5698     -224     
  Branches     1245     1193      -52     
==========================================
- Hits         5502     5287     -215     
+ Misses        420      411       -9     

Impacted Files	Coverage Δ
packages/opentelemetry-web/src/utils.ts
...ntelemetry-web/src/enums/PerformanceTimingNames.ts
...ackages/opentelemetry-web/src/WebTracerProvider.ts
...kages/opentelemetry-web/src/StackContextManager.ts
packages/opentelemetry-web/src/types.ts