chore: add discontinuation notices

bye bye eifueo :(

docs/g11/chw3mz.md

@@ -2,6 +2,11 @@
 
 The course code for this page is **CHW3MZ**.
 
+!!! 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**The Eifueo project is no longer maintained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>
+
 ## Command terms
 
 The following terms are regularly used by IB and have specific meanings:

docs/g11/eng3uz.md

@@ -2,6 +2,11 @@
 
 The course code for this page is **ENG3UZ**.
 
+!!! 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**The Eifueo project is no longer maintained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>
+
 ## Literary techniques/devices
 
 ### Description

docs/g11/mcv4u7.md

@@ -2,6 +2,11 @@
 
 The course code for this page is **MCV4U7**.
 
+!!! 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**The Eifueo project is no longer maintained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>
+
 ## Integration
 
 Integration is an operation that finds the **net** area under a curve, and is the opposite operation of differentiation. As such, it is also known as **anti-differentiation**.

docs/g11/mhf4u7.md

@@ -2,6 +2,11 @@
 
 The course code for this page is **MHF4U7**.
 
+!!! 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**The Eifueo project is no longer maintained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>
+
 ## Review
 
 ### Logarithm rules

docs/g11/sch3uz.md

@@ -2,6 +2,11 @@
 
 The course code for this page is **SCH3UZ**.
 
+!!! 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**The Eifueo project is no longer maintained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>
+
 ## 1.1 - Review and base knowledge
 
 ### Binary ionic and molecular compound nomenclature

docs/g11/sph3u7.md

@@ -2,6 +2,11 @@
 
 The course code for this page is **SPH3U7**.
 
+!!! 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>
+
 ## 1.1 - Measurements in physics
 
 !!! reminder

docs/g11/sph4u7.md

@@ -2,6 +2,11 @@
 
 The course code for this page is **SPH4U7**.
 
+!!! 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>
+
 ## Magnetism
 
 Magnets are objects with north/south dipoles that create a field around them. Although ferromagnetic substances can repel each other, paramagnetic substances are always attracted to a magnetic field. See [HL Chemistry#Physics properties of transition elements](/sch3uz/#physical-properties-of-transition-elements) for more details.

docs/g11/tok.md

@@ -1,5 +1,10 @@
 # Theory of Knowledge
 
+!!! 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>
+
 ## Knowledge questions and claims
 
 There are two types of knowledge **claims**: