Added Oxford Dictionary shortcut

[sanjana-shriram]

Description

Added a new command, define, to the list of commands. Define redirects the user to the Oxford English Dictionary and search terms can be included in the query.

Closes #43

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

This new command was tested locally in the browser.

• Navigate to localhost:3000 and check if define shows up on the list of commands
• Type "define x" where x is the word you want to define in the browser

Test Configuration:

• Node.js version: 16.17.0
• Python version: 3.9
• Desktop/Mobile: Desktop
• OS: Windows
• Browser: Chrome

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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[rajgodse]

LGTM