made improvement

[KishoreVB70]

1. Made grammar improvements
2. Fixed typos
3. Removed extra white space in file name
4. Added introduction and Requirements heading
5. Removed bold for Heading as it is redundant
6. Corrected the heading levels of Bootstrap and build the UI to level 2
7. Removed extra characters inside code blocks
8. Corrected command line code blocks from JSX to bash
9. Added links to Technologies used
10. Fixed the numbering in the bootstrap section as all the numbers are currently 1 instead of a sequence
11. Removed unwanted blank spaces in the tutorial
12. Corrected the heading levels of conclusion, deploying and testing from level 3 to level 2
13. Added yarn install for the command line argument which was missing
14. Removed bold for inline code blocks as some showed **** directly instead of bolding over the code block which seems redundant
15. Also the bolding was not standardized throughout the tutorial as the later part of the tutorial has inline code blocks without bolding
16. Removed blank spaces within the code blocks
17. Removed full stop from heading
18. Used numbered list instead of bullet points where required
19. Added inline code blocks for variables and file names in code explanation