Addon Cleanup - Githubissues

After implementing the new addon framework, we have some pieces of the community struct and contract that are no longer used.

This is the current struct:

pub struct Community {
    pub admins: Vec<AccountId>,
    pub handle: CommunityHandle,
    pub name: String,
    pub tag: String,
    pub description: String,
    pub logo_url: String,
    pub banner_url: String,
    pub bio_markdown: Option<String>,
    pub github_handle: Option<String>,
    pub telegram_handle: Vec<String>,
    pub twitter_handle: Option<String>,
    pub website_url: Option<String>,
    pub github: Option<String>, // remove
    pub board: Option<String>, // remove
    pub wiki1: Option<WikiPage>, //remove
    pub wiki2: Option<WikiPage>, //remove
    pub features: CommunityFeatureFlags, //remove
    pub addons: Vec<CommunityAddOn>,
}

We can remove "github", "board", "wiki1", "wiki2", "features".

With these removed, we can also remove some functions:

[ ] update_community_feature_flags
[ ] update_community_github
[ ] update_community_board
[ ] update_community_wiki1
[ ] update_community_wiki2

There may be more, I would recommend a thorough search.

NEAR-DevHub / neardevhub-contract

Addon Cleanup #74