docs: Link fixes such as 301 redirects (#26586)

docs/en/frames_multicopter/omnicopter.md

@@ -19,7 +19,7 @@ The components needed for this build are:
     You can select your own flight controller of choice, it just needs to support 8 DShot outputs.
     :::
   - GPS: [ZED-F9P](https://gnss.store/zed-f9p-gnss-modules/105-elt0092.html)
-  - [GPS helix antenna](https://gnss.store/gnss-rtk-multiband-antennas/28-elt0014.html)
+  - [GPS helix antenna](https://gnss.store/products/elt0014)
     ::: info
     Any other GPS may work as well, however a helix antenna is expected to perform better for inverted flights.
     :::
@@ -32,8 +32,8 @@ The components needed for this build are:
   - Battery: we used a 6S 3300mAh LiPo. Make sure to check the dimensions so it fits the frame.
   - Battery strap
 - Frame:
-  - Carbon square tube R 8mm X 7mm X 1000mm, e.g. [here on shop.swiss-composite.ch](https://shop.swiss-composite.ch/pi.php/Halbfabrikate/Rohre/Vierkant-Rohre/CFK-Vierkantrohr-8x8-7x7mm.html)
-  - Carbon Rods R 3mm X 2mm X 1000mm, e.g. [here on shop.swiss-composite.ch](https://shop.swiss-composite.ch/pi.php/Halbfabrikate/Rohre/CFK-Rohre-pultrudiert-pullwinding/Carbon-Microtubes-100cm-x-20-3mm.html)
+  - Carbon square tube R 8mm X 7mm X 1000mm, e.g. [here on shop.swiss-composite.ch](https://www.shop.swiss-composite.ch/pi.php/Halbfabrikate/Rohre/Vierkant-Rohre/CFK-Vierkantrohr-8x8-7x7mm.html)
+  - Carbon Rods R 3mm X 2mm X 1000mm, e.g. [here on shop.swiss-composite.ch](https://www.shop.swiss-composite.ch/pi.php/Halbfabrikate/Rohre/CFK-Rohre-pultrudiert-pullwinding/Carbon-Microtubes-100cm-x-20-3mm.html)
   - Required lengths:
     - square tube: 8 pieces with length of 248mm
     - rods: 12x328mm, 6x465mm