seo: add meta tags to guides

Author: avivace

list/guides/asmstyle.md

@@ -1,3 +1,13 @@
+---
+head:
+  - - meta
+    - name: og:title
+      content: GB ASM style guide
+  - - meta
+    - name: og:description
+      content: This style guide aims to formalize a style that most Game Boy ASM programmers agree on, and provide a good baseline for new programmers just starting in this field.
+---
+
 # Game Boy ASM style guide
 
 Written by [ISSOtm](https://github.com/ISSOtm/)

list/guides/deadcscroll.md

@@ -1,3 +1,13 @@
+---
+head:
+  - - meta
+    - name: og:title
+      content: Dead C Scroll tutorial
+  - - meta
+    - name: og:description
+      content: An assembly tutorial for Game Boy showing how the scroll registers can be exploited to create some nice and interesting effects.
+---
+
 # Dead C Scroll
 
 An assembly tutorial for Game Boy showing how the scroll registers can be exploited to create some nice and interesting effects.

list/guides/lyc_timing.md

@@ -1,3 +1,12 @@
+---
+head:
+  - - meta
+    - name: og:title
+      content: Timing of LYC STAT Handlers
+  - - meta
+    - name: og:description
+      content: Guide on how to implement raster effects is with the rLYC register.
+---
 
 # The Timing of LYC STAT Handlers
 

list/guides/tools.md

@@ -1,3 +1,14 @@
+---
+head:
+  - - meta
+    - name: og:title
+      content: Choosing tools for Game Boy development
+  - - meta
+    - name: og:description
+      content: Overview of the available tools for Game Boy development.
+---
+
+
 # Choosing tools for Game Boy development