removed static webp and did some nginx conf

_config.yml

@@ -199,6 +199,7 @@ plugins:
   - jekyll-scholar
   - jekyll-data
   - jekyll-archives
+  - jekyll-webp
   - jemoji
 
 # mimic GitHub Pages with --safe
@@ -273,3 +274,42 @@ scholar:
   group_by: year
   group_order: descending
   relative: "/publications"
+
+############################################################
+# Site configuration for the WebP Generator Plugin
+# The values here represent the defaults if nothing is set
+webp:
+  enabled: true
+
+  # The quality of the webp conversion 0 to 100 (where 100 is least lossy)
+  quality: 85
+
+  # List of directories containing images to optimize, nested directories will only be checked if `nested` is true
+  # By default the generator will search for a folder called `/img` under the site root and process all jpg, png and tiff image files found there.
+  img_dir: ["/assets/"]
+
+  # Whether to search in nested directories or not
+  nested: true
+
+  # add ".gif" to the format list to generate webp for animated gifs as well
+  formats: [".jpeg", ".jpg", ".png", ".tiff"]
+
+  # File extensions for animated gif files
+  gifs: [".gif"]
+
+  # Set to true to always regenerate existing webp files
+  regenerate: false
+
+  # Local path to the WebP utilities to use (relative or absolute)
+  # Omit or leave as nil to use the utilities shipped with the gem, override only to use your local install
+  # Eg : "/usr/local/bin/cwebp"
+  webp_path: nil
+
+  # List of files or directories to exclude
+  # e.g. custom or hand generated webp conversion files
+  exclude: []
+
+  # append '.webp' to filename after original extension rather than replacing it.
+  # Default transforms `image.png` to `image.webp`, while changing to true transforms `image.png` to `image.png.webp`
+  append_ext: true
+############################################################