Add sales and invoices section in users' page

[matislebg95]

Closes #484

[codecov]

❌ 7 Tests Failed:

Tests completed	Failed	Passed	Skipped
257	7	250	0

View the top 3 failed test(s) by shortest run time

UsersTest::test_deleting_a_machine

Stack Traces | 0.642s run time

Failure:
test_deleting_a_machine(Minitest::Result) [.../views/sales/_sale.html.erb:6]:
ActionView::Template::Error: undefined method 'name' for nil
    .../views/sales/_sale.html.erb:6
    .../views/sales/_sale.html.erb:5
    .../views/users/show.html.erb:129

UsersTest::test_visiting_profile

Stack Traces | 0.672s run time

Failure:
test_visiting_profile(Minitest::Result) [.../views/sales/_sale.html.erb:6]:
ActionView::Template::Error: undefined method 'name' for nil
    .../views/sales/_sale.html.erb:6
    .../views/sales/_sale.html.erb:5
    .../views/users/show.html.erb:129

UsersTest::test_editing_the_profile

Stack Traces | 0.679s run time

Failure:
test_editing_the_profile(Minitest::Result) [.../views/sales/_sale.html.erb:6]:
ActionView::Template::Error: undefined method 'name' for nil
    .../views/sales/_sale.html.erb:6
    .../views/sales/_sale.html.erb:5
    .../views/users/show.html.erb:129

UsersTest::test_editing_a_machine

Stack Traces | 12.9s run time

Failure:
test_editing_a_machine(Minitest::Result) [.../views/sales/_sale.html.erb:6]:
ActionView::Template::Error: undefined method 'name' for nil
    .../views/sales/_sale.html.erb:6
    .../views/sales/_sale.html.erb:5
    .../views/users/show.html.erb:129

UsersTest::test_signing_out_should_redirect_to_root_page

Stack Traces | 13s run time

Failure:
test_signing_out_should_redirect_to_root_page(Minitest::Result) [.../views/sales/_sale.html.erb:6]:
ActionView::Template::Error: undefined method 'name' for nil
    .../views/sales/_sale.html.erb:6
    .../views/sales/_sale.html.erb:5
    .../views/users/show.html.erb:129

UsersTest::test_adding_a_new_machine

Stack Traces | 13s run time

Failure:
test_adding_a_new_machine(Minitest::Result) [.../views/sales/_sale.html.erb:6]:
ActionView::Template::Error: undefined method 'name' for nil
    .../views/sales/_sale.html.erb:6
    .../views/sales/_sale.html.erb:5
    .../views/users/show.html.erb:129

UsersTest::test_signing_in_should_redirect_to_user_profile

Stack Traces | 13.1s run time

Failure:
test_signing_in_should_redirect_to_user_profile(Minitest::Result) [.../views/sales/_sale.html.erb:6]:
ActionView::Template::Error: undefined method 'name' for nil
    .../views/sales/_sale.html.erb:6
    .../views/sales/_sale.html.erb:5
    .../views/users/show.html.erb:129

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