Multiple Gherkin syntax errors

### Subject of the issue

Multiple Gherkin syntax issues that cause compilation failure with test engines:

### Your environment
SpecFlow

If I get to it before you do I will fix with a PR from my fork. Here are the issues:

c2c.feature : Scenario has no name, incorrect syntax.

indexer.feature - Duplicate scenarios Scenario Outline: /applications?id=&limit=&next=

indexer.feature - Duplicate scenarios Scenario Outline: /applications/

indexer.feature - Duplicate scenarios Scenario Outline: /accounts?asset-id=&limit=>=<=&auth-addr=&app-id=

v2algodclient_paths.feature: Duplicated scenarios Scenario Outline: Account Information

v2algodclient_paths.feature: Duplicated scenarios Scenario Outline: LookupAccountByID path

v2algodclient_paths.feature: Duplicated scenarios Scenario Outline: SearchForApplications path

v2algodclient_paths.feature: Duplicated scenarios Scenario Outline: SearchAccounts path

rekey.feature is incorrectly named Feature: Sending transactions, which duplicates the send.feature

send.feature has two @send scenarios, when one should be called @send.multisig

# Acceptance Criteria

Fix syntax warnings.