* Standardize spelling to American English (only in .md files)
* Update remaining British english spell words to American english style
* Configures the codespell pre-commit hook to enforce US English consistency
changes:
- Activates the `en-GB_to_en-US` built-in dictionary to flag British spellings
- Created codespell-ignore-words.txt file to ignore specific words
- include `code` and `names` for comprehensive typo checking in technical contexts.
- changed the 'lets' to 'let's'.
