docs: new docs

site/Docs/usage.md

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+# Usage
+
+```sh
+kewt --help
+kewt --version
+kewt --new [title]
+kewt --post [title]
+kewt --generate-template [path]
+kewt --update [dir]
+kewt --from <src> --to <out>
+kewt [src] [out]
+```
+- `--new [title]` creates a new site directory with a default `site.conf`, `template.html`, and `index.md`.
+- `--post [title]` creates a new markdown file in the configured `posts_dir` with the current date/time as the filename and default frontmatter.
+- `--generate-template [path]` writes the default `template.html` to the given path (defaults to `template.html` in the current directory).
+- `--update [dir]` adds any missing keys to `site.conf` and checks `template.html` against the latest default.
+
+## site.conf
+
+```conf
+title = "kewt"
+style = "kewt"
+dir_indexes = true
+single_file_index = true
+flatten = false
+order = ""
+home_name = "Home"
+show_home_in_nav = true
+nav_links = ""
+nav_extra = ""
+footer = "made with <a href=\"https://kewt.krzak.org\">kewt</a>"
+logo = ""
+display_logo = false
+display_title = true
+logo_as_favicon = true
+favicon = ""
+generate_page_title = true
+error_page = "not_found.html"
+versioning = false
+enable_header_links = true
+base_url = ""
+generate_feed = false
+feed_file = "rss.xml"
+posts_dir = ""
+custom_admonitions = ""
+```
+- `title` - site title
+- `style` - style file name from `./styles` (without `.css`)
+- `dir_indexes` - generate directory index pages when missing `index.md`
+- `single_file_index` - if a directory has one markdown file and no `index.md`, use that file as `index.html`
+- `flatten` - flatten sidebar directory levels
+- `order` - comma separated file/directory name list to order the sidebar (alphabetical by default)
+- `home_name` - text for the home link in navigation (default: "Home")
+- `show_home_in_nav` - show home link in navigation (default: true)
+- `nav_links` - comma separated extra nav links, as bare URLs or Markdown links like `[Label](https://example.com)`
+- `nav_extra` - raw HTML appended inside the `<nav>` after the generated link list
+- `footer` - footer html/text shown at the bottom of pages
+- `logo` - logo image path (used in header if enabled)
+- `display_logo` - show logo in header
+- `display_title` - show title text in header
+- `logo_as_favicon` - use `logo` as favicon
+- `favicon` - explicit favicon path (used when `logo_as_favicon` is false or no logo is set)
+- `generate_page_title` - automatically generate title text from the first markdown heading or filename (default: true)
+- `error_page` - filename for the generated 404 error page (default: "not_found.html", empty to disable)
+- `versioning` - append a version query parameter (`?v=timestamp`) to css asset urls to bypass cache (default: false)
+- `base_url` - absolute URL of the site, used for sitemap and RSS feed generation
+- `generate_feed` - enable RSS feed generation (requires `base_url`)
+- `feed_file` - filename for the generated RSS feed (default: "rss.xml")
+- `posts_dir` - directory name containing posts (e.g., "posts"). Enables reverse-chronological sorting, title headings in indexes, and automatic backlinks.
+- `enable_header_links` - turns markdown section headings into clickable anchor links (default: true)
+- `custom_admonitions` - comma separated list of custom admonitions