Interactive SICP-JS: Changes to style and formatting

[samuelfangjw]

Description

1. Adjust spacing of authors section on index page
   Before:

After:

2. Add elevation to code snippets. On hover, change cursor to pointer and increase elevation. Currently, it's not very obvious that code snippets can be clicked, this should make it a little more obvious.

Screen.Recording.2021-06-17.at.7.00.56.PM.mov

3. Make caret in table of contents larger. On hover, change colour to indicate that it can be clicked. The current caret is a little too small and could be made more obvious.

Screen.Recording.2021-06-17.at.7.03.15.PM.mov

4. Fix margins around block quotes. Block quotes now have a fixed margin of 10px on the top and bottom. Previously there was no margin on the top.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Code quality improvements

How to test

Ensure the changes described in the description are present.

Checklist

• I have tested this code
• I have updated the documentation

[coveralls]

Pull Request Test Coverage Report for Build 946161428

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 30.179%

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Totals
Change from base Build 945411239:	0.0%
Covered Lines:	3231
Relevant Lines:	9872

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💛 - Coveralls

[martin-henz]

Nice attention to detail.