doc: fix documentation

Signed-off-by: Haobo Gu <[email protected]>

Author: HaoboGu

docs/book.toml

@@ -10,14 +10,6 @@ build-dir = "book"                # the directory where the output is placed
 create-missing = true             # whether or not to create missing pages
 extra-watch-dirs = ["po"]             # directories to watch for triggering builds
 
-[preprocessor.gettext]
-after = ["links"]
-
-[output.xgettext]
-optional = true
-pot-file = "messages.pot"
-granularity = 0
-
 [output.html]
 default-theme = "light"
 preferred-dark-theme = "ayu"
@@ -28,9 +20,6 @@ no-section-label = true
 git-repository-url = "https://github.com/HaoboGu/rmk"
 git-repository-icon = "fa-github"
 edit-url-template = "https://github.com/HaoboGu/rmk/docs/{path}"
-additional-css = [
-  "theme/css/language-picker.css",
-]
 
 [output.html.fold]
 enable = true