chore(skydive): remove jumps /feed route

Following is a CMS concept (article feed by followed authors).
Applying it to jumps was a design error — no component ever called
this endpoint. Removed route and associated UserService.getUserFollowed
dependency from skydive.

src/routes/api/skydive/jumps.routes.js

@@ -273,45 +273,6 @@ router.get('/allFromSkydiverIdApi', auth.required, function (req, res, next) {
     }).catch(next);
 });
 
-router.get('/feed', auth.required, async function (req, res, next) {
-    let limit = 25;
-    let offset = 0;
-    if (typeof req.query.limit !== 'undefined') {
-        limit = req.query.limit;
-    }
-    if (typeof req.query.offset !== 'undefined') {
-        offset = req.query.offset;
-    }
-
-    try {
-        const user = await UserService.getUserById(req.payload.id);
-        if (!user) {
-            return res.status(401).json({ errors: { "Unauthorized": "autentification requise" } });
-        }
-        const following = await UserService.getUserFollowed(user);
-        const followingIds = following.map(u => u.id);
-        let query = { author: { $in: followingIds } };
-        const [jumps, jumpsCount] = await Promise.all([
-            Jump.find(query)
-                .skip(Number(offset))
-                .limit(Number(limit))
-                .populate('author')
-                .populate('files')
-                .populate('x2data')
-                .exec(),
-            Jump.count(query)
-        ]);
-        return res.json({
-            jumps: jumps.map(function (jump) {
-                return jump.toJSONFor(null);
-            }),
-            jumpsCount: jumpsCount
-        });
-    } catch (err) {
-        next(err);
-    }
-});
-
 /**
  * return last jump
  */