Fix typos in README.md

## Context
Fix typos in file `README.md`

## Description
1. **First Paragraph:**
- "anchoring and _javascript_" --> "anchoring and _JavaScript_"
2. **Developer Instructions:**
- "_On_ the project directory" --> "_In_ the project directory"
- "chrome://_extensiones_" --> "chrome://_extensions_"
- "_Develepor_ Mode" --> "_Developer_ Mode"
3. **Fetching HTTP Status Codes:**
- "you would like this process to _hasppen_ automatically" --> "you would like this process to _happen_ automatically"
4. **Filtering:**
- "simply _seperate_ the arguments" --> "simply _separate_ the arguments"
- "modifieres" --> "modifiers"
- "indicative of a *succes* or an error" --> "indicative of a *success* or an error"
5. **Negation:**
- "alos" --> "also"
- "critera" --> "criteria"
6. **Grouping:**
- "gouping" --> "grouping"
7. **Group by Rewrite Rule:**
- "_reggular_ expression" --> "_regular_ expression"