Make documentation standalone and generalize examples

docs/interface/dashboards.md

@@ -501,13 +501,13 @@ start and renames the file `panels.json.migrated`.
 
 ### A screen without a browser
 
-The openpanel firmware, kept in its own repository, draws dashboards as native
-widgets on an ESP32-P4 wall panel (Waveshare ESP32-P4-WIFI6-Touch-LCD-7B,
-1024×600). Once its config page points it at this instance (the device's link
-works too, the device keeps only its address), it shows the pairing code itself; enter it as in step 5. It reads the same published
-dashboards and live values and draws every widget type with two exceptions,
-both shown as a placeholder: a website tile that embeds a page (image tiles
-work), and a chart of runs, which a device credential may not read. Media tiles
+Compatible device firmware can draw dashboards as native widgets without a
+browser. For example, openpanel supports ESP32-P4 wall panels. Once its
+config page points it at this instance, it shows a pairing code; enter it as
+in step 5. The device's link works too, since the device keeps only the
+instance address. It reads the same published dashboards and live values.
+Embedded website tiles and run charts show placeholders; image tiles work,
+and device credentials cannot read runs. Media tiles
 play MJPEG streams, pushed frames, images, and H.264 Baseline or MJPEG clips up
 to 640×360. Re-encode other clips with the [clip recipe](../code/nodes.md#making-clips-playable-on-an-lvgl-panel).
 
@@ -625,9 +625,9 @@ A camera device (openpanel on a NANO) reports these ports:
 dashboard tile, the preview on the device's page, a screen through the
 portal), or a node of a running flow reads its message. Once its flow wires
 `camera`, the device's page shows a **Camera** preview. A flow that reads
-`camera` keeps it sending all the time, about 300 GB a month through a cloud
-instance, so the Device node warns when a node in its flow reads a port that
-sends on demand. Have flows read `snapshot` or `person` instead. To keep the
+`camera` keeps it sending continuously. Traffic depends on resolution, frame
+rate and image quality, so the Device node warns when a flow node reads an
+on-demand port. For occasional updates, read `snapshot` or `person`. To keep the
 picture of whoever came by, a node reading `snapshot` can hand it on to a
 message of its own, which a media tile shows until the next one: