feat: add post for february updates

_posts/2024-02-29-february-updates.md

@@ -0,0 +1,12 @@
+---
+title:  "February 2024 updates"
+date: 2024-02-29
+---
+
+New this february:
+
+* @DCoder18 added [`border-spacing`](/features/css-border-spacing/) , [`border-collapse`](/features/css-border-collapse/), [`user-select`](/features/css-user-select/), [`<acronym>`](/features/html-acronym/) and updated [`filter`](/features/css-filter/). 
+* @husseinalhammad added the [HTML `hidden` attribute](/features/html-hidden/) and updated [`<ul>, <ol>` and `<dl>`](/features/html-lists/).
+* @michael-westphal updated the [HEIF image format](/features/image-heif/).
+
+Thanks to the three of them for these contributions.