chore: add discontinuation notices

bye bye eifueo :(

docs/1b/ece106.md

@@ -1,5 +1,10 @@
 # ECE 106: Electricity and Magnetism
 
+!!! warning
+    <p style="font-size: 1rem">**The Eifueo project is no longer maintained
+    as of 19 April 2023. Information in this repository may no longer be accurate.
+    Please see [the main blog post](https://eggworld.me/blog/2023/sunsetting-eifueo) for more details.**</p>
+
 ## MATH 117 review
 
 !!! definition

docs/1b/ece108.md

@@ -1,5 +1,10 @@
 # ECE 108: Discrete Math 1
 
+!!! warning
+    <p style="font-size: 1rem">**The Eifueo project is no longer maintained
+    as of 19 April 2023. Information in this repository may no longer be accurate.
+    Please see [the main blog post](https://eggworld.me/blog/2023/sunsetting-eifueo) for more details.**</p>
+
 An **axiom** is a defined core assumption of the mathematical system held to be true without proof.
 
 !!! example

docs/1b/ece124.md

@@ -1,5 +1,10 @@
 # ECE 124: Digital Circuits
 
+!!! warning
+    <p style="font-size: 1rem">**The Eifueo project is no longer maintained
+    as of 19 April 2023. Information in this repository may no longer be accurate.
+    Please see [the main blog post](https://eggworld.me/blog/2023/sunsetting-eifueo) for more details.**</p>
+
 ## Base / radix conversion
 
 Please see [ECE 150: C++#Non-decimal numbers](/1a/ece150/#non-decimal numbers) for more information.

docs/1b/ece140.md

@@ -1,5 +1,10 @@
 # ECE 140: Linear Circuits
 
+!!! warning
+    <p style="font-size: 1rem">**The Eifueo project is no longer maintained
+    as of 19 April 2023. Information in this repository may no longer be accurate.
+    Please see [the main blog post](https://eggworld.me/blog/2023/sunsetting-eifueo) for more details.**</p>
+
 ## Voltage, current, and resistance
 
 Please see [SL Physics 1#Electric potential](/g11/sph3u7#electric-potential) for more information on voltage.

docs/1b/math119.md

@@ -1,5 +1,10 @@
 # MATH 119: Calculus 2
 
+!!! warning
+    <p style="font-size: 1rem">**The Eifueo project is no longer maintained
+    as of 19 April 2023. Information in this repository may no longer be accurate.
+    Please see [the main blog post](https://eggworld.me/blog/2023/sunsetting-eifueo) for more details.**</p>
+
 ## Multivariable functions
 
 !!! definition