Model Export

[madil4]

The goal is to allow users to export models that are generated by Awatif to other structural engineering software for further verification or design.

Functional Requirements:

• Should export Awatif's model to JSON
• Should export Awatif's model to DXF

Technical Requirements:

• Should setup staging environment #238
• Should setup Jest for testing #234
• Should have an export link #258
• Should have an export modal #232
• Should download the exported format #233
• Should export Awatif model and results to JSON #257
• Should convert Awatif model to DXF format #237
• Should document how to export models #230