Remove unused BASE_URL

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.63% :tada:

Comparison is base (0513560) 98.41% compared to head (6f5cace) 99.05%. Report is 10 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #158 +/- ## ========================================== + Coverage 98.41% 99.05% +0.63% ========================================== Files 8 8 Lines 443 424 -19 ========================================== - Hits 436 420 -16 + Misses 7 4 -3 ``` | [Files Changed](https://app.codecov.io/gh/CSCI-GA-2820-SU23-001/shopcarts/pull/158?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CSCI-GA-2820-SU23-001) | Coverage Δ | | |---|---|---| | [service/common/error\_handlers.py](https://app.codecov.io/gh/CSCI-GA-2820-SU23-001/shopcarts/pull/158?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CSCI-GA-2820-SU23-001#diff-c2VydmljZS9jb21tb24vZXJyb3JfaGFuZGxlcnMucHk=) | `100.00% <ø> (+16.66%)` | :arrow_up: | | [service/routes.py](https://app.codecov.io/gh/CSCI-GA-2820-SU23-001/shopcarts/pull/158?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CSCI-GA-2820-SU23-001#diff-c2VydmljZS9yb3V0ZXMucHk=) | `100.00% <100.00%> (ø)` | |

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