controllers: Update Forum links

Done using this python script:

    import re
    import requests
    import sys

    def replace_forum_url(matchobj):
        oldurl = matchobj.group(0).decode().replace("&", "&")
        oldurl = "https://mixxx.discourse.group" + oldurl.partition("forums")[2]
        print(oldurl)
        req = requests.head(oldurl, allow_redirects=True)
        return req.url.replace("&", "&").encode()

    for file in sys.argv[1:]:
        with open(file, mode="rb") as f:
            content = f.read()

        content = re.sub(rb'https?://mixxx.org/forums/[\w\?&;=\/\.]+', replace_forum_url, content)

        with open(file, mode="wb") as f:
            f.write(content)

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