Add label definition reply, Fixes #91

[JasirZaeem]

Added ability to reply to the original tweet with the definition of the label it uses. Fixes #91

Changes

• Changed get_reply.py to take a label as it's parameter and return a definition if it exists.
• Updated tweet.py to call get_reply, obtain a reply, and tweet it if a definition exists.
• Added definitions for some terms, definitions were obtained from Wiktionary, I have not added definitions for words where where the words did not exist on Wiktionary, or there was an ambiguity about how I should structure them. Other people can decide on them and add them, the bot will skip replying when a definition does not exist.
• Removed a stray image generated and committed to the repo earlier which is not in use anywhere.
• Added my name to the contributors list.

[JasirZaeem]

I would prefer to have as many definitions added together as possible, in this PR while its waiting to be merged :) , so I have added a commit fixing those two definitions. The ones I had doubts about and did not add myself, I would like for people to discuss and add as they see fit. I am open to adding more definitions here while the PR is still open if there are any suggestions.

[bobsany16]

You've done so much and for that, pat yourself on the back!! 👌👌. I think it's good that you're thinking and leaving some of the labels to others! If I have any suggestions on any labels, I'll let you know! @JasirZaeem