Fixes and Improvements

[FarzeenKist]

• Fix typos across the tutorial
• Fix some grammar and punctuation
• Fix the issue of using decimal numbers in the example smart contract which was causing compiling issues
• Apply the concept of basis points to work with percentages in the smart contract and adjusted codebase
• Add a note that helps users to find the code for the AggregatorV3 Interface
• Add configure settings for Hardhat in the deployment section to make it easy for readers to quickly set up Hardhat for the Alfajores testnet.
• Add the requirements section to let users know what tools they should have to follow the tutorial smoothly
• Add a pre-requisites section to allow users to know what they should know to be able to follow the tutorial without any issues
• Fix the title of the tutorial for best practices
• Add links and references to technologies or concepts mentioned in the tutorial
• Improve documentation of both smart contract
• Add a modifier that ensures the arguments for the amount parameter are valid values
• Indented the code snippets in the Setting Up Your Development Environment explanation to improve readability.
• Modified the command that installs Hardhat to install Hardhat as a development dependency. It is unnecessary to install Hardhat as a global package.

Observations

• Currently, no ChainLink data feed is available on the Alfajores testnet. I would suggest you switch to another Oracle that supports the Celo blockchain(such as Witnet) to make it easy for users to test the smart contracts on the Celo blockchain
• I would suggest further explanations of the principle and logic used in the _calculateStability function as currently it's a bit confusing.