[SOL-1835] Add guideline link to catalog query string.

[WL-523] Coupon Admin is able creates Discount code with 0 percentage.

[SOL-1859] Omit unavailable seats in offer landing page.

[SOL-1861] Include max_uses when editing a coupon.

[SOL-1863] Check if course seat types attribute exists before using it

[SOL-1864] Hide code field for quantity > 1 coupons

WL-434: Support theme previews via URL parameter

Fix for new offer landing page.

Check for enrollment API response

[WIP] [SOL-1847] Change not-selected values to null on toggling catalog type.

Fix voucher offers API endpoint

[SOL-1845] Check if user is enrolled on coupon redemption

Before redeeming a coupon and enrolling a user check if the user is already enrolled in that course.

[SOL-1819] Multi offer coupon.

Enable ONCE_PER_CUSTOMER and MULTI_USE coupon types to have max_uses and quantity > 1 at the same time.
This requires each of the vouchers to have individual offers associated with them.

Added ellipsis to long offer page course title

[SOL-1831] Show maximum uses in coupon detail page

Seat Types formated, tests added

Fix voucher offers API endpoint

Cache voucher offers

Bump up page_size when calling course catalog

Use the correct error template

[SOL-1785] Frontend changes for new invoice fields.