[Dev][Proposal] Complete cpp/lang/ASCII charts; Change overflow: scrollbar to overflow: auto

[mumupika]

In commit 9e67707:

1. Change the DeclDoc part overflow: scrollbar to overflow: auto, remove redundant scrollbar.

Current:

After Change:

2. Complete Ascii Chart, related to page: https://en.cppreference.com/w/cpp/language/ascii.html

In commit a2d9c4b

3. Align the columns since there is a blank column.

[vercel]

@mumupika is attempting to deploy a commit to the microcber's projects Team on Vercel.

A member of the Team first needs to authorize it.