Fixed ScholarX logo size in tablet view [fixes #205]

[Kinshu-Learner]

Purpose

The purpose of this PR is to fix #205

Goals

Reduced the font sizes of nav items slightly, along with some paddings and margins in tablet view so as to make space for the ScholarX logo to fit completely.

Screenshots

Checklist

• This PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.
• I have read and understood the development best practices guidelines ( http://bit.ly/sef-best-practices )
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

[anjula-sack]

Thank you! @Kinshu-Learner