[Gene-Level Functional Predictions]: Add queried gene name prominently to top of Appyter notebooks

[KMJ1618]

When a gene is input to generate a notebook via the Gene-Level Functional Predictions Appyter, that queried gene name does not appear anywhere in the generated notebook. This becomes challenging when comparing multiple notebooks, as it's not easy to determine which notebook corresponds to which queried gene. Suggested fix: Add as a prominent header in each notebook the queried gene symbol.

Example: In the notebook generated for queried gene ASIC4, searching the notebook for "ASIC4" returns no results:
https://appyters.maayanlab.cloud/Gene_Level_Functional_Predictions/525817a393fe80d762ef79e9a33647c23ba4ae6d/