Update `schedules` page to use new `all/route_overview`

[albertkun]

@anithegregorian As per #540 we refactored the api endpoint:

https://api.metro.net/all/route_overview

to use all/route_overview's data that is now categorized with route_type and routes as an array.

route_type are the following:

• rail
• busway
• bus
• express (this can be ignored)

[
    {
        "route_type": "rail",
        "routes": [
            { ...route... },
            { ...route... },
        ]
    },
    {
        "route_type": "busway",
        "routes": [
            { ...route... },
            { ...route... },
        ]
    },
    {
        "route_type": "bus",
        "routes": [
            { ...route... },
            { ...route... },
        ]
    },
]

Feel free to let me know if you have any questions!