feat: add css upside down table trick til

css/upside-down-table-trick.md

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+# Upside Down Table Trick
+
+It can be difficult to build highly customizable, scrollable tables.
+Relocating a horizontal table's scrollbar from the default bottom position, to the top of a table, is one such finnicky customization.
+
+To accomplish this:
+
+1. Flip the table's parent wrapper `<div>` upside down, using `rotateX(180deg)`
+2. Place the header at the bottom (which, at this point, is the top)
+3. Flip the `<tbody>` inside th table
+4. Flip the content inside the `<thead>`.
+
+This will relocate the table's scrollbar to the top. And, moreso, it will be sticky, so it's always within reach.
+
+via. [RGBCube](https://lobste.rs/s/dghv8d/please_make_your_table_headings_sticky#c_iztvit).
+
+[PoC](https://lobste.rs/s/dghv8d/please_make_your_table_headings_sticky#c_hww77t)