remove unused assets

selfdrive/assets/images/triangle.svg

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-version https://git-lfs.github.com/spec/v1
-oid sha256:aaf9a1967365f2c641bf7b54a409e32842cee0bfded7ebb01b1a95c4ac9f0154
-size 2163

selfdrive/assets/offroad/icon_calibration.png

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:0d68f2739bd1b8fc990e0d171923c58c382714c7d8ec6cd43f1f808ac87f963c
-size 8910

selfdrive/assets/offroad/icon_close.svg

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:4eff44a05132ed9f99ad821993be4bab9b1a1c880e07441f3b887214bee62afe
-size 825

selfdrive/assets/offroad/icon_menu.png

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:ae8c4922909415dcf51cca6ac54790d3019cc934bf719bda112aa7a9cba8eae3
-size 635

selfdrive/assets/offroad/icon_minus.png

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:8d2c5640258911c94475615b9c4abc1485c74239f65bef70e0bab9ca84619772
-size 2577

selfdrive/assets/offroad/icon_network.png

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:6eec8334979c2ba5751560a9b6b322d2a5852970b0f783b68112e92bb7c82826
-size 39872

selfdrive/assets/offroad/icon_road.png

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:735fa47333bddaa91af6d120fd2f76dc562657962abdc55de810d9a77d6e5516
-size 6674

selfdrive/assets/offroad/icon_settings.png

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:a522be46c662753063fce319bd29f252df1b2ec082eb4dbd6518d59bdf6a5fa4
-size 13369

selfdrive/assets/offroad/icon_shell.png

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:c37ee59b9d273193cedae3408ce29b22d8b2d27732235c62065e78c5eca5812d
-size 42462

selfdrive/assets/offroad/icon_wifi_uploading.svg

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:bedd579f56c65fffe2ad571f92843b6d103826fe173f8f5b58fc2200d2ad8850
-size 1663