fix highlight and copybutton related issue

[LXYan2333]

There is a lot of highlight issue in the original webpage:

1. several code block missing ```fortran identifier

2. some console block is identified as shell, which is used for shell script file highlight (ref: https://github.com/github-linguist/linguist/blob/466ed9937ffe5609ab565f43d7305a5d46410622/lib/linguist/languages.yml#L6738)

   this does not only affect the highlight, but also confused the copybutton sphinx extension. for example:

   ```shell
   $ echo 1
   \ ```
   

   in this case, copybutton will copy $ echo 1, but if this block is identified as console then echo 1 will be copied.

3. there is one line added in conf.py, which is used to strip command output from the copied text. the related document can be found on here