Include some cool mermaid diagrams in the docs to illustrate the data flow

[reyang]

For example:

graph LR

subgraph SDK
  MeterProviderX[MeterProvider X]
  MeterProviderY[MeterProvider Y]
  MetricReaderA[BaseExportingMetricReader]
  MetricReaderB[PeriodicExportingMetricReader]
end

subgraph API
  subgraph Meter Baz
  InstrumentA[Instrument A]
  InstrumentB[Instrument B]
  InstrumentC[Instrument C]
  end
  subgraph Meter Foo
  InstrumentD[Instrument D]
  end
  subgraph Meter Bar
  InstrumentE[Instrument E]
  InstrumentF[Instrument F]
  end
end

InstrumentA --> | Measurements | MeterProviderY
InstrumentB --> | Measurements | MeterProviderY
InstrumentC --> | Measurements | MeterProviderY
InstrumentD --> | Measurements | MeterProviderX
InstrumentE --> | Measurements | MeterProviderX
InstrumentF

MeterProviderX --> | Metrics | MetricReaderA --> | Pull | PrometheusExporter
MeterProviderY --> | Metrics | MetricReaderB --> | Push | OtlpExporter

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