Use inline LaTeX to replace images and code tags in RFCs

[doitian]

RFCs like https://github.com/nervosnetwork/rfcs/blob/master/rfcs/0020-ckb-consensus-protocol/0020-ckb-consensus-protocol.md uses a lot of formulas. Since GitHub has shipped the feature to render inline LaTeX, it's time to replace the images for better reading experience.

RFC like https://github.com/nervosnetwork/rfcs/blob/master/rfcs/0023-dao-deposit-withdraw/0023-dao-deposit-withdraw.md can replace code tags with LaTex as well.

• RFC20 https://github.com/nervosnetwork/rfcs/blob/master/rfcs/0020-ckb-consensus-protocol/0020-ckb-consensus-protocol.md
• RFC23 https://github.com/nervosnetwork/rfcs/blob/master/rfcs/0023-dao-deposit-withdraw/0023-dao-deposit-withdraw.md

[yangby-cryptape]

I think this suggestion is good, but a bit early for now, since the inline LaTeX had so many bugs and unstable.

• Bugs: I had opened tickets for those bugs SEVERAL WEEKS AGO, but GitHub hasn't fixed them.

  The last time (more than a month ago), they replied to me:

  There isn't an ETA we can share for the moment, but we'll keep you informed of our progress.

  Thank you for your patience and sorry for the inconvenience!

  Since then, I got no feedback.

  Here is one example:

  • A formula in RFC-0020:
    

  • Rendered by GitHub (If you see the correct rendering, that means at least they fixed one bug I met):

    $$ HPS_{i} = \left{ \begin{aligned} & HPS_{i-1} \times \frac{1}{\tau} ;, & \overline{HPS_{i}} \lt \frac{1}{\tau} HPS_{i-1} \\ & HPS_{i-1} \times \frac{1}{\tau} ;, & \overline{HPS_{i}} \gt \tau HPS_{i-1} \\ & \overline{HPS_{i}} & \text{otherwise} \\ \end{aligned} \right. $$

    p.s. This LaTeX code has been tested with both MathJax Demo and StackEdit (KaTeX backend).

    Click HERE to see the LaTeX Code.

    $$
    HPS_{i} = \left\{
        \begin{aligned}
            & HPS_{i-1} \times \frac{1}{\tau} \;, & \overline{HPS_{i}} \lt \frac{1}{\tau} HPS_{i-1} \\
            & HPS_{i-1} \times \frac{1}{\tau} \;, & \overline{HPS_{i}} \gt \tau HPS_{i-1} \\
            & \overline{HPS_{i}} & \text{otherwise} \\
        \end{aligned}
    \right.
    $$
    

• Unstable: some days the rendering are correct, but some days are incorrect.

  I had to tolerate that when I wrote RFC-0044.