feat: customize sock links

[Anas12091101]

Description

This PR enables the customization of sock links in studio. Currently the sock links are hard coded in sock_links.html and two of them are redirecting to a 404 error page. This PR makes them configurable by adding the sock links in the settings and then using them in the sock_links.html

Useful information to include:

• Which edX user roles will this change impact? "Course Author"
• Include screenshots for changes to the UI (ideally, both "before" and "after" screenshots, if applicable).
  Before

After
1) When SHOW_SOCK_LINKS_BTN = False

2) Customized links

• Provide links to the description of corresponding configuration changes. Remember to correctly annotate these
  changes.

Supporting information

Issue: openedx/platform-roadmap#325

Testing instructions

• In your private.py, include SHOW_SOCK_LINKS_BTN = False. Now go to studio home and you will not see the Looking for help with studio? dropdown.
• In your private.py, include
  • SOCK_LINKS = [ { 'href': 'http://docs.edx.org', 'sr_mouseover_text': 'Access documentation on http://docs.edx.org', 'text': 'edX Documentation', 'condition': True }, { 'href': 'https://open.edx.org', 'sr_mouseover_text': 'Access the Open edX Portal', 'text': 'Open edX Portal', 'condition': True }, { 'href': 'https://www.edx.org/course/overview-creating-edx-course-edx-edx101#.VO4eaLPF-n1', 'sr_mouseover_text': 'Enroll in edX101: Overview of Creating an edX Course', 'text': 'Enroll in edX101', 'condition': True }, { 'href': 'https://www.edx.org/course/creating-course-edx-studio-edx-studiox', 'sr_mouseover_text': 'Enroll in StudioX: Creating a Course with edX Studio', 'text': 'Enroll in StudioX', 'condition': True } ]
    You will see the customized links on your studio home like this
    

Deadline

None

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