doc/check-health: update notifications

---- ✂️ ----
⚡📉 Health warning: voltage

The voltage on MikroTik jumped more than 10%.

old value: 16.2V
new value: 12.4V
---- ✂️ ----
🔥 Health warning: temperature

The temperature on MikroTik is above threshold: 51°C
---- ✂️ ----
✅ Health recovery: temperature

The temperature on MikroTik dropped below threshold: 47°C
---- ✂️ ----
❌ Health warning: psu1-state

The power supply unit 'psu1-state' on MikroTik failed!
---- ✂️ ----
✅ Health recovery: psu1-state

The power supply unit 'psu1-state' on MikroTik recovered!
---- ✂️ ----

11 files changed, 5 insertions, 173 deletions

diff --git a/doc/check-health.d/notification-01-voltage.avif b/doc/check-health.d/notification-01-voltage.avif
new file mode 100644
index 0000000..f4d6005
--- /dev/null
+++ b/doc/check-health.d/notification-01-voltage.avif
diff --git a/doc/check-health.d/notification-01-voltage.svg b/doc/check-health.d/notification-01-voltage.svg
deleted file mode 100644
index 4c9caad..0000000
--- a/doc/check-health.d/notification-01-voltage.svg
+++ /dev/null
@@ -1,36 +0,0 @@
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-  <text id="text4811" transform="matrix(.26458 0 0 .26458 -45.077 -6.6039)" x="-248.88142" fill="#000000" font-family="'Fira Mono', 'Roboto Mono', monospace" font-size="12px" letter-spacing="0px" stroke-width="1px" word-spacing="0px" style="font-variant-caps:normal;font-variant-east-asian:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:15px;shape-inside:url(#rect4813);white-space:pre" xml:space="preserve"><tspan id="tspan13643" x="180" y="10.85">[MikroTik] ⚡📉 Health warning: voltage
-</tspan><tspan id="tspan13645" x="180" y="25.85">
-</tspan><tspan id="tspan13647" x="180" y="40.85">The voltage on MikroTik jumped more than 10%.
-</tspan><tspan id="tspan13649" x="180" y="55.85">
-</tspan><tspan id="tspan13651" x="180" y="70.85">old value: 16.2V
-</tspan><tspan id="tspan13653" x="180" y="85.85">new value: 12.4V</tspan></text>
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-</svg>
diff --git a/doc/check-health.d/notification-02-temperature-high.avif b/doc/check-health.d/notification-02-temperature-high.avif
new file mode 100644
index 0000000..1a93610
--- /dev/null
+++ b/doc/check-health.d/notification-02-temperature-high.avif
diff --git a/doc/check-health.d/notification-02-temperature-high.svg b/doc/check-health.d/notification-02-temperature-high.svg
deleted file mode 100644
index 0ab9488..0000000
--- a/doc/check-health.d/notification-02-temperature-high.svg
+++ /dev/null
@@ -1,33 +0,0 @@
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-</tspan><tspan id="tspan13711" x="180" y="25.85">
-</tspan><tspan id="tspan13713" x="180" y="40.85">The temperature on MikroTik is above threshold: 51°C</tspan></text>
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diff --git a/doc/check-health.d/notification-03-temperature-ok.avif b/doc/check-health.d/notification-03-temperature-ok.avif
new file mode 100644
index 0000000..3bb9c68
--- /dev/null
+++ b/doc/check-health.d/notification-03-temperature-ok.avif
diff --git a/doc/check-health.d/notification-03-temperature-ok.svg b/doc/check-health.d/notification-03-temperature-ok.svg
deleted file mode 100644
index 180d13f..0000000
--- a/doc/check-health.d/notification-03-temperature-ok.svg
+++ /dev/null
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-  <text id="text4811" transform="matrix(.26458 0 0 .26458 -45.077 -6.6039)" x="-248.88142" fill="#000000" font-family="'Fira Mono', 'Roboto Mono', monospace" font-size="12px" letter-spacing="0px" stroke-width="1px" word-spacing="0px" style="font-variant-caps:normal;font-variant-east-asian:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:15px;shape-inside:url(#rect4813);white-space:pre" xml:space="preserve"><tspan id="tspan13679" x="180" y="10.85">[MikroTik] ✅ Health recovery: temperature
-</tspan><tspan id="tspan13681" x="180" y="25.85">
-</tspan><tspan id="tspan13683" x="180" y="40.85">The temperature on MikroTik dropped below threshold: 48°C</tspan></text>
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diff --git a/doc/check-health.d/notification-04-psu-fail.avif b/doc/check-health.d/notification-04-psu-fail.avif
new file mode 100644
index 0000000..a4e52a9
--- /dev/null
+++ b/doc/check-health.d/notification-04-psu-fail.avif
diff --git a/doc/check-health.d/notification-04-psu-fail.svg b/doc/check-health.d/notification-04-psu-fail.svg
deleted file mode 100644
index f7efe4b..0000000
--- a/doc/check-health.d/notification-04-psu-fail.svg
+++ /dev/null
@@ -1,33 +0,0 @@
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-     <path id="path945" d="m3.3407-0.52096c0.034969-0.00777 0.038854 0.015542 0.041445 0.041445 0.098431 1.8054 0.85998 3.1744 1.8689 4.1108 1.0089 0.93639 2.3636 1.6941 4.274 1.6604-3.5772 1.4247-7.337-1.9984-6.1856-5.8126"/>
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-</tspan><tspan id="tspan2173" x="180" y="25.85">
-</tspan><tspan id="tspan2175" x="180" y="40.85">The power supply unit 'psu1-state' on MikroTik failed!</tspan></text>
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diff --git a/doc/check-health.d/notification-05-psu-ok.avif b/doc/check-health.d/notification-05-psu-ok.avif
new file mode 100644
index 0000000..bcc5a39
--- /dev/null
+++ b/doc/check-health.d/notification-05-psu-ok.avif
diff --git a/doc/check-health.d/notification-05-psu-ok.svg b/doc/check-health.d/notification-05-psu-ok.svg
deleted file mode 100644
index 0a3f05c..0000000
--- a/doc/check-health.d/notification-05-psu-ok.svg
+++ /dev/null
@@ -1,33 +0,0 @@
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diff --git a/doc/check-health.md b/doc/check-health.md
index 9ee16bb..d84693a 100644
--- a/doc/check-health.md
+++ b/doc/check-health.md
@@ -27,17 +27,17 @@ hardware supports:
 
 #### Voltage
 
-![check-health notification voltage](check-health.d/notification-01-voltage.svg)
+![check-health notification voltage](check-health.d/notification-01-voltage.avif)
 
 #### Temperature
 
-![check-health notification](check-health.d/notification-02-temperature-high.svg)  
-![check-health notification](check-health.d/notification-03-temperature-ok.svg)
+![check-health notification](check-health.d/notification-02-temperature-high.avif)  
+![check-health notification](check-health.d/notification-03-temperature-ok.avif)
 
 #### PSU state
 
-![check-health notification](check-health.d/notification-04-psu-fail.svg)  
-![check-health notification](check-health.d/notification-05-psu-ok.svg)
+![check-health notification](check-health.d/notification-04-psu-fail.avif)  
+![check-health notification](check-health.d/notification-05-psu-ok.avif)
 
 Requirements and installation
 -----------------------------