Remove interwiki entries with zero relevance to Arch

The interwiki map is intended to simplify frequent linking to the same
sites, but I doubt there will be need to link to these sites from
ArchWiki. An annotated list of the target audience for the removed sites
is presented for reference:

    advogato            community blogging site
    c2find              "content creation wiki"
    dictionary          a dictionary...
    docbook             XML/SGML vocabulary about hardware and software
                        (last change in 2013, vastly incomplete)
    dwjwiki             about a specific person
    elibre              universal free encyclopedia in Spanish
    foxwiki             no idea...
    gej                 Esperanto in Deutschland
    hammondwiki         about the Hammond organ (a musical instrument)
    hrwiki              Homestar Runner Wiki, about a cartoon
    imdb                movies database
    jargonfile          subset of metawiki
    memoryalpha         Star Trek
    metawiki            a search engine "with sauce"
    oeis                the On-Line Encyclopedia of Integer Sequences
    ppr                 same as c2find
    senseislibrary      about the game of Go
    sourcewatch         corporate campaigns
    tejo                no idea...
    tmbw                for the fans of They Might Be Giants
    tmnet               off-topic, last change around 2006
    theopedia           an encyclopedia of Biblical Christianity
    uea                 wiki of the Universal Esperanto Association
    uncyclopedia        useless, ArchWiki is a serious resource
    webseitzwiki        no idea...
    wiki                same as c2find
    wikif1              about motorsport
    wikihow             off-topic, too general
    wikinfo             universal open content reference resource, but
                        unlike Wikipedia, its articles are subjective

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