remove hardcoded rates and seed, remove docs

seeds/schema.yaml

@@ -41,42 +41,3 @@ seeds:
               min_value: 0
               max_value: 8
               strictly: False
-  - name: stg_seed__hardcoded_currency_rates
-    description: |
-      A bunch of rates between currencies, taken from our invoicing cycle in February 2024. 
-
-      These are hardcoded and so will become outdated, but it's the best we have now since we don't have a live feed for exchange rates.
-    config:
-      column_types:
-        from_currency: varchar(3)
-        to_currency: varchar(3)
-        rate: numeric
-    columns:
-      - name: from_currency
-        data_type: character varying
-        description: The 3 character ISO 4217 code for the base currency, in Uppercase.
-        tests:
-          - not_null
-          - dbt_expectations.expect_column_values_to_match_regex:
-              regex: "^[A-Z]{3}$"
-        columns:
-      - name: to_currency
-        data_type: character varying
-        description: The 3 character ISO 4217 code for the target currency, in Uppercase.
-        tests:
-          - not_null
-          - dbt_expectations.expect_column_values_to_match_regex:
-              regex: "^[A-Z]{3}$"
-      - name: rate
-        data_type: numeric
-        description: |
-          The rate between the two currencies. You should read it as the amount of target currency you get for each unit of base currency.
-
-          For example: for the combination EUR-GBP, a rate of 0.8 means you get 0.8 GBP for 1 EUR.
-
-          Rates between same-currency pairs are always one.
-        tests:
-          - not_null
-          - dbt_expectations.expect_column_values_to_be_between:
-              min_value: 0.00000000001
-              max_value: 999999999999