[FIX] Replace defunct awaresystems.be and fslwiki links (#1874)

* [FIX] Replace defunct awaresystems.be link with Wayback machine link

* [FIX] fslwiki is redirecting to fsl/docs

src/modality-specific-files/magnetic-resonance-imaging-data.md

@@ -721,7 +721,7 @@ within the `[*_]dwi.bval` and `[*_]dwi.bvec` files) MAY change across DWI runs.
 
 **Gradient orientation file formats**.
 The `[*_]dwi.bval` and `[*_]dwi.bvec` files MUST follow the
-[FSL format](https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/FDT/UserGuide#DTIFIT):
+[FSL format](https://fsl.fmrib.ox.ac.uk/fsl/docs/#/diffusion/index?id=diffusion-data-in-fsl):
 The `[*_]dwi.bvec` file contains 3 rows with *N* space-delimited floating-point numbers
 (corresponding to the *N* volumes in the corresponding NIfTI file.)
 The first row contains the *x* elements, the second row contains the *y* elements and

src/modality-specific-files/microscopy.md

@@ -55,7 +55,7 @@ Microscopy raw data MUST be stored in one of the following formats:
 
 -   [OME-TIFF](https://docs.openmicroscopy.org/ome-model/6.1.2/ome-tiff/specification.html#)
     (`.ome.tif` for standard TIFF files or `.ome.btf` for
-    [BigTIFF](https://www.awaresystems.be/imaging/tiff/bigtiff.html) files)
+    [BigTIFF](https://web.archive.org/web/20240706160214/https://www.awaresystems.be/imaging/tiff/bigtiff.html) files)
 
 -   [OME-ZARR/NGFF](https://ngff.openmicroscopy.org/latest/) (`.ome.zarr` directories)