Broken links for lingads download

[CarlosCaris]

In the EC_class_ligands_search_pc.ipynb there is a variable called baseUrl = "https://files.rcsb.org/ligands/download/", which is broken. Searching on the source website the new base url should be "https://files.rcsb.org/ligands/" and the construction of the download string could be as forme as follows:

baseUrl = "https://files.rcsb.org/ligands/"

for ChemID in molResultL:
    first_part_url = ChemID[0]
    second_part_url = ChemID
    cFile = f"{ChemID}_ideal.mol2"
    cFileUrl = baseUrl + first_part_url + "/" + second_part_url + "/" + cFile
    cFileLocal = "ligands/" + cFile
    response = requests.get(cFileUrl)
    with open(cFileLocal, "w+") as file:
        file.write(response.text)