small refactor of names in the schema

[utunga]

Can we rename hashtagmeta to jsut hashtag per the following, pretty please

type HashtagVariant {
    id: ID!
    variant: String! @id @search(by: [exact, regexp])
    hashtag: Hashtag! @hasInverse(field: "hashtagVariants")
    skills: [Skill] @hasInverse(field: "hashtagVariants")
    requests: [Request] @hasInverse(field: "hashtagVariants")
}

type Hashtag {
    id: ID!
    name: String! @id @search(by: [exact, regexp])
    iconName: String
    blessed: Boolean @search
    blessedInt: Int
    hashtagVariants: [HashtagVariant] @hasInverse(field: "hashtag")
    skillCountAllTime: Int
    requestCountAllTime: Int
    skillCountLast24h: Int
    requestCountLast24h: Int
    skillCountLast1w: Int
    requestCountLast1w: Int
}

``