.dev: use Git LFS for our blog images (tldraw#4530)

Convert the items in `/blog` to use Git LFS to avoid making our repo too
heavy.

I turned on the setting in Vercel to enable this as well.

<img width="952" alt="Screenshot 2024-09-16 at 11 27 26"
src="https://github.com/user-attachments/assets/bcae59d7-46ff-46dd-a053-06efa918f213">

### Change type

- [ ] `bugfix`
- [ ] `improvement`
- [ ] `feature`
- [ ] `api`
- [x] `other`

.husky/pre-push

@@ -0,0 +1,3 @@
+#!/bin/sh
+command -v git-lfs >/dev/null 2>&1 || { echo >&2 "\nThis repository is configured for Git LFS but 'git-lfs' was not found on your path. If you no longer wish to use Git LFS, remove this hook by deleting '.git/hooks/pre-push'.\n"; exit 2; }
+git lfs pre-push "$@"

apps/docs/README.md

@@ -128,6 +128,8 @@ The auto-generated docs content is created using [tsdoc](https://tsdoc.org/) and
 
 ## Developing the docs
 
+You'll need to install Git LFS to get our blog post images (which can be large). See instructions [here](https://docs.github.com/en/repositories/working-with-files/managing-large-files/installing-git-large-file-storage).
+
 When developing the docs, any change to the `content` folder will cause the page to refresh. This is a little shitty but it mostly works.
 
 ## Contribution

apps/docs/public/images/blog/.gitattributes

@@ -0,0 +1,4 @@
+*.gif filter=lfs diff=lfs merge=lfs -text
+*.png filter=lfs diff=lfs merge=lfs -text
+*.heic filter=lfs diff=lfs merge=lfs -text
+*.mp4 filter=lfs diff=lfs merge=lfs -text