Several bugs in the backend

[BALaka-18]

Description

There are 3 bugs in the backend that I came across while resolving issue #5 :

1. In experience.html, the delete button redirect is faulty.
2. wkhtmktopdf is not configured.
3. PDF download was throwing ProtoocolError due to inability to access image files.

The issues mentioned above have been corrected by me. Raising this issue so that I can send in the PR that resolves these.

Definition of Done

• All of the required items are completed.
• Approval by 1 mentor.

[BALaka-18]

@DiptoChakrabarty please assign me this issue and put in proper labels so that I can send in the PR.

[DiptoChakrabarty]

Sure go ahead @BALaka-18 , can you tell me the where the button in experience page is redirecting to

[BALaka-18]

Sure go ahead @BALaka-18 , can you tell me the where the button in experience page is redirecting to

@DiptoChakrabarty the delete button isn't redirecting back to the experience.html page, it's throwing up an error saying it can't find what it wants to redirect to.
I had written the Submit button by mistake in the Issue description, I have rectified it. It is the Delete button.

[BALaka-18]

@DiptoChakrabarty found 2 more bugs, will rectify them in the next PR that I send.

1. The 'Add' button in the Achievements page redirects to the Skills page instead of redirecting back to the same page.
2. In the Achievements page, when the achievements are displayed, the name of the achievement is displayed twice, instead of displaying the name and the description respectively.