Fixes:
  - Submission type should only be required for SciPost Physics.
  - Changed failing jQuery CDN.
  - ArXiv query result html update to improve reading.
  - Summernote loading debugging (sometimes failed to load).

If you are updating on a machine please follow these steps
*BEFORE* updating your code to this commit.

If you are installing on a fresh database and do not need to think
about existing data, ignore the following and proceed as usual.

1. Run the following migrations:
```
python manage.py migrate --fake scipost zero
python manage.py migrate --fake notifications zero
python manage.py migrate --fake partners zero
python manage.py migrate --fake affiliations zero
python manage.py migrate --fake commentaries zero
python manage.py migrate --fake comments zero
python manage.py migrate --fake finances zero
```

2. *** NOW UPDATE/PULL GIT ***
3. Run: `python manage.py migrate --fake-initial`