docs(backend): Document some functions and structures

Signed-off-by: Lucien Cartier-Tilet <lucien@phundrak.com>

src/data.rs

@@ -6,6 +6,9 @@ pub struct Data {
     pub user: User,
 }
 
+/// GitHub user
+///
+/// Contains their newest, most starred, and pinned repositories,
 #[derive(Default, Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct User {
@@ -14,24 +17,31 @@ pub struct User {
     pub pinned: Pinned,
 }
 
+/// Newest repositories
 #[derive(Default, Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct Newest {
     pub nodes: Vec<Repository>,
 }
 
+/// Most starred repositories
 #[derive(Default, Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct MostStarred {
     pub nodes: Vec<Repository>,
 }
 
+/// Pinned repositories
 #[derive(Default, Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct Pinned {
     pub nodes: Vec<Repository>,
 }
 
+/// Repository
+///
+/// Contains the name of the repository, the amount of stars, and the
+/// amount of forks of the repository
 #[derive(Default, Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase", rename = "node")]
 pub struct Repository {