Fix the eslint warnings

[periclestavares]

Fix the eslint warnings:

./src/components/Header.tsx
Line 13: Using target="_blank" without rel="noopener noreferrer" is a security risk: see https://mathiasbynens.github.io/rel-noopener react/jsx-no-target-blank

./src/index.tsx
Line 16: 'version' is assigned a value but never used @typescript-eslint/no-unused-vars

./src/services/trader.service.ts
Line 1: 'StoryId' is defined but never used @typescript-eslint/no-unused-vars

./src/components/StoryDetails.tsx
Line 1: 'KeyboardEvent' is defined but never used @typescript-eslint/no-unused-vars
Line 5: 'ContentEditable' is defined but never used @typescript-eslint/no-unused-vars

./src/redux/reducers/index.ts
Line 2: 'sprintsReducer' is defined but never used @typescript-eslint/no-unused-vars
Line 3: 'teamsReducer' is defined but never used @typescript-eslint/no-unused-vars
Line 4: 'teamMembersReducer' is defined but never used @typescript-eslint/no-unused-vars
Line 6: 'Sprint' is defined but never used @typescript-eslint/no-unused-vars
Line 7: 'TeamMember' is defined but never used @typescript-eslint/no-unused-vars
Line 8: 'Team' is defined but never used @typescript-eslint/no-unused-vars

./src/components/StoryList.tsx
Line 3: 'addStory' is defined but never used @typescript-eslint/no-unused-vars
Line 3: 'removeStory' is defined but never used @typescript-eslint/no-unused-vars
Line 3: 'selectStory' is defined but never used @typescript-eslint/no-unused-vars
Line 3: 'removeTask' is defined but never used @typescript-eslint/no-unused-vars

./src/components/TaskItem.tsx
Line 4: 'Icon' is defined but never used @typescript-eslint/no-unused-vars

./src/redux/actions.ts
Line 62: 'addTeam' is defined but never used @typescript-eslint/no-unused-vars
Line 69: 'updateTeam' is defined but never used @typescript-eslint/no-unused-vars
Line 76: 'removeTeam' is defined but never used @typescript-eslint/no-unused-vars
Line 88: 'addTeamMember' is defined but never used @typescript-eslint/no-unused-vars
Line 95: 'updateTeamMember' is defined but never used @typescript-eslint/no-unused-vars
Line 102: 'removeTeamMember' is defined but never used @typescript-eslint/no-unused-vars

./src/components/StoryListItem.tsx
Line 62: 'storyIndex' is assigned a value but never used @typescript-eslint/no-unused-vars
Line 62: 'deleteStory' is assigned a value but never used @typescript-eslint/no-unused-vars

[miguelcarvalho13]

@periclestavares @gilesv Should those warnings be removed or fixed?

[periclestavares]

@miguelcarvalho13 fixed. I updated the title and description.