[Doc] Add JSDoc linter & general comment clean up (#611)

- Prefer comments above lines over end-of-line comments
  - Makes auto-formatting easier
  - Subjective, but it is generally easier to read in JS
- Standardises JSdoc format
- Auto-fixes for many issues (applies on save w/ESLint extension)

src/Reroute.ts

@@ -29,7 +29,6 @@ export class Reroute implements Positionable, LinkSegment, Serialisable<Serialis
   #network: WeakRef<LinkNetwork>
 
   #parentId?: RerouteId
-  /** @inheritdoc */
   public get parentId(): RerouteId | undefined {
     return this.#parentId
   }