Remove all em-dashes from website content and documentation

Replace ' — ' with ', ' across 40 files. Hyphens (-) untouched.
timecapsule, stefankoelle, LICENSE, CSS comments left as-is.

smarthome/tasmota-energy/index.njk

@@ -27,7 +27,7 @@ and LED matrix displays.</p>
 
 <h2>Multi-socket power strips</h2>
 <p>Several rooms use multi-outlet smart power strips (each socket
-individually switchable and metered) rather than single smart plugs — this
+individually switchable and metered) rather than single smart plugs, this
 keeps things like "washing machine + dryer" or "office desk cluster" on
 one strip while still tracking each socket's consumption separately.</p>
 
@@ -35,7 +35,7 @@ one strip while still tracking each socket's consumption separately.</p>
 <p>New devices go through a standard conversion flow (from the
 manufacturer's original cloud-dependent firmware to Tasmota) using a
 well-documented community process. It occasionally fails on the first
-attempt due to a transient Wi-Fi handshake issue — retrying resolves it
+attempt due to a transient Wi-Fi handshake issue, retrying resolves it
 without any special handling.</p>
 
 <h2>How the data flows</h2>
@@ -60,7 +60,7 @@ via Flux to display real-time and historical usage charts.</p>
 
 <h2>Why Tasmota over alternatives</h2>
 <p>Tasmota was chosen over alternatives like ESPHome or Tuya firmware for
-several reasons. The local-only control means no cloud dependency — the
+several reasons. The local-only control means no cloud dependency, the
 plugs work even if the internet is down. The MQTT integration is mature
 and well-documented. The energy monitoring sensors are accurate enough
 for home use (typically within 5% of a dedicated energy meter). And the