hledger-ui, hledger-web: add page; hledger: update page (#12824)

pages/common/hledger-web.md

@@ -0,0 +1,33 @@
+# hledger-web
+
+> Web interface and API to `hledger`.
+> A robust, friendly plain text accounting app.
+> More information: <https://hledger.org/hledger-web.html>.
+
+- Start the web app, and a browser if possible, for local viewing and adding only:
+
+`hledger-web`
+
+- As above but with a specified file, and allow editing of existing data:
+
+`hledger-web --file {{path/to/file.journal}} --allow edit`
+
+- Start just the web app, and accept incoming connections to the specified host and port:
+
+`hledger-web --serve --host {{my.host.name}} --port 8000`
+
+- Start just the web app's JSON API, and allow only read access:
+
+`hledger-web --serve-api --host {{my.host.name}} --allow view`
+
+- Show amounts converted to current market value in your base currency when known:
+
+`hledger-web --value now --infer-market-prices`
+
+- Show the manual in Info format if possible:
+
+`hledger-web --info`
+
+- Display help:
+
+`hledger-web --help`