Add new subject form

[nquynh06]

No description provided.

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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[thu4n]

• Add description text box to add more info about the new course
• Show them the PR URL after successful submission
• If they add it directly to their grade table, let them know that the data exist temporarily and will be lost after cache deletion or new website update
• Use GitHub Apps to create PR instead of using PAT
• Add ceiling for course credits
• User must login to GitHub to submit the form