Quick start guide is out of date

[mgovers]

The Quick Start guide is still not in the best possible state cfr. the following observations:

• self_test is imported twice
• the Batch data example script will result in an error, because:
  • the IDs of the update data are not set
  • the input data contains only 1 sym_load, while the update data has 4 sym_loads per batch scenario. This will result in errors, even if the IDs are set. Instead, either the input data needs to be updated, or the update data needs to have a number of components per scenario equal to 1.

This is, however, out of scope of this PR. I will create a new issue for this.

Originally posted by @mgovers in #709 (review)