Processing Verification Report and Data Stewardship Flow diagram

[siddharth0248]

Create processing and verification reports for:

• [x] Vulcan
• [x] Gra2pes
• [x] NIST Urban Testbed

Create data flow diagram for:

• [x] Vulcan
• [x] Gra2pes
• [x] NIST Urban Testbed

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Update the GHGC-DOCS

[siddharth0248]

An initial draft of data flow diagrams: https://app.diagrams.net/#G1w5nnltaHUNibqlpPnf4dCGuV9tNPECYP#%7B%22pageId%22%3A%22aAkLZ8WRnZ_v5wyp6SPW%22%7D