Move from Dropbox to Sharepoint (Consumable scripts)

[sakshimohan]

This PR update the locations of raw consumables files from dropbox to the new sharepoint folder.

In addition, the following updates are made -

1. A column identifying the category (programmatic) which consumables belong to has been added to ResourceFile_Consumables_availability_small.csv. This information is used in certain scripts (plotting cost estimates, predicting availability for consumable scenarios) - Previously this was taken from the large consumable availability ResourceFile_Consumables_availability_and_usage.csv
2. Superfluous .py scripts which are no longer being used are removed - descriptive_stats.py, clean_fac_locations.py
3. Columns Units per case and Unit_Cost are dropped from ResourceFile_Consumables_Items_and_Packages.csv
   (Following Issue Remove deprecated concept of Consumables Packages  #1303)

Pending tasks

• Add diagnostics/medicine/other categorisation from resources/healthsystem/consumables/ResourceFile_Consumables_Item_Designations.csv to into ResourceFile_Consumables_Items_and_Packages.csv so that the definitions are all in one place
• Confirm whether the column Intervention_Pkg_Code also needs to be dropped from ResourceFile_Consumables_Item_Designations.csv

[sakshimohan]

@tbhallett Should I also drop the Intervention_Pkg_Code column from ResourceFile_Consumables_Items_and_Packages.csv?