Fix broken link in vista3d and modify import section in vista2d (#1837)

### Checks
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [ ] Avoid including large-size files in the PR.
- [ ] Clean up long text outputs from code cells in the notebook.
- [ ] For security purposes, please check the contents and remove any
sensitive info such as user names and private key.
- [ ] Ensure (1) hyperlinks and markdown anchors are working (2) use
relative paths for tutorial repo files (3) put figure and graphs in the
`./figure` folder
- [ ] Notebook runs automatically `./runner.sh -t <path to .ipynb file>`

---------

Signed-off-by: YunLiu <[email protected]>

Author: KumoLiu

vista_2d/vista_2d_tutorial_monai.ipynb

@@ -53,18 +53,13 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "!python -c \"import monai\" || pip install -q monai\n",
-    "!python -c \"import fire\" || pip install -q fire\n",
-    "!python -c \"import tifffile\" || pip install -q tifffile\n",
-    "!python -c \"import imagecodecs\" || pip install -q imagecodecs\n",
-    "!python -c \"import PIL\" || pip install -q pillow\n",
+    "!python -c \"import monai\" || pip install -q \"monai-weekly[fire, tifffile, imagecodecs, pillow, tqdm]\"\n",
     "!python -c \"import fastremap\" || pip install -q fastremap\n",
     "!python -c \"import cellpose\" || pip install -q cellpose\n",
     "!python -c \"import natsort\" || pip install -q natsort\n",
     "!python -c \"import roifile\" || pip install -q roifile\n",
     "!python -c \"import ipykernel\" || pip install -q ipykernel\n",
     "!python -c \"import cv2\" || pip install -q opencv-python-headless\n",
-    "!python -c \"import tqdm\" || pip install -q tqdm\n",
     "!python -c \"import numba\" || pip install -q numba\n",
     "!python -c \"import segment_anything\" || pip install -q git+https://github.com/facebookresearch/segment-anything.git\n",
     "%matplotlib inline"

vista_3d/vista3d_spleen_finetune.ipynb

@@ -32,7 +32,7 @@
     "\n",
     "The Spleen dataset can be downloaded from http://medicaldecathlon.com/.\n",
     "\n",
-    "![spleen](../../figures/spleen0.png)\n",
+    "![spleen](../figures/spleen0.png)\n",
     "\n",
     "Target: Spleen  \n",
     "Modality: CT  \n",