Prune examples/llava. Dead code.

examples/llava has been replaced by mtmd since late 2025, and has 
been out-of-build in ik_llama.cpp since examples/CMakeLists.txt removed it
in ikawrakow#798.

Repointed descriptions from llava to mtmd where they remained.

Author: Farmadupe

common/common.cpp

@@ -3205,7 +3205,7 @@ void gpt_params_print_usage(int /*argc*/, char ** argv, const gpt_params & param
     options.push_back({ "*",           "-nocb, --no-cont-batching",     "disable continuous batching" });
 
     options.push_back({ "multi-modality" });
-    options.push_back({ "*",           "       --mmproj FILE",          "path to a multimodal projector file for LLaVA. see examples/llava/README.md" });
+    options.push_back({ "*",           "       --mmproj FILE",          "path to a multimodal projector file. see examples/mtmd/README.md" });
     options.push_back({ "*",           "       --image FILE",           "path to an image file. use with multimodal models. Specify multiple times for batching" });
     options.push_back({ "*",           "       --image-min-tokens N",   "minimum number of tokens each image can take, only used by vision models with dynamic resolution (default: read from model)"});
     options.push_back({ "*",           "       --image-max-tokens N",   "maximum number of tokens each image can take, only used by vision models with dynamic resolution (default: read from model)" });