@posts/OuroborosSinCos.md; improves

Is similar to: commit 450066f (@`posts/OuroborosSinCos.md`; `remark-lint` fixes:). TODO: group this with thus
@`./posts/OuroborosSinCos.md`;
	+`#discussion-2`: *Fourier-transform* discussion moved to `# Discussion 2`, which now includes followup question of how to use *Fourier-transform* on `sin` / `cos`.
	`:%s/^    /> /`: replaces block code with block quotes.
		`:%s/\[\([0-9,. ]\+\)\]/`\0`/`: just used for rows which got *Markdown* errors such as "warning Unexpected reference to undefined definition, expected corresponding definition (`-0.4161, 0.9093`)" from the switch to block quotes.

Author: SwuduSusuwu