Fix inconsistency and misinformation in gddocs

[notanerd314]

The download link for the music library song is supposed to be .ogg not .mp3. I've changed it to avoid any other confusion.
I've also add some minor details in resources/levels.md and added NCS guantlets.
And fixed getGJLevelLists.php mistaken as levels.

[Geming400]

Btw, to make the ncs gauntelts "appear" from the server response you need to include the BINARY_VERSION, I haven't checked if you need the 2.206's binary version or if it just accepts anything

NCS gauntlets:

BINARY_VERSION = 46
def get_raw_gauntlets(self, get21gauntlet=False) -> str:
    '''
    Return a list of raw Gauntlets
    '''
    data = {
"secret": COMMON_SECRET,
"special": 1,
"binaryVersion": BINARY_VERSION # Used for the NCS Gautlets (for some reasons)
}
    if get21gauntlet:
        data["special"] = 0
    
    req = requests.post(ROOTURL + "database/getGJGauntlets21.php", data=data, headers=HEADERS)
    return req.text

without the NCS gauntlets:

BINARY_VERSION = 46
def get_raw_gauntlets(self, get21gauntlet=False) -> str:
    '''
    Return a list of raw Gauntlets
    '''
    data = {
"secret": COMMON_SECRET,
"special": 1
}
    if get21gauntlet:
        data["special"] = 0
    
    req = requests.post(ROOTURL + "database/getGJGauntlets21.php", data=data, headers=HEADERS)
    return req.text

[iAndyHD3]

Most of the changes look good, but please make separate PRs, one giant PR is difficult to review. Make one PR where you fix periods, other where you edit other general info etc. basically don't mix all the changes in a giant pr. Also revise which stuff has already been added (merge conflicts)

[notanerd314]

Most of the changes look good, but please make separate PRs, one giant PR is difficult to review. Make one PR where you fix periods, other where you edit other general info etc. basically don't mix all the changes in a giant pr. Also revise which stuff has already been added (merge conflicts)

Thanks