<!--- Provide a general summary of your changes in the Title above -->
<!--- Describe your changes in detail -->
Fixed the links for open issues and developer documentation in the[ main documentation page](https://concept-to-clinic.readthedocs.io/en/latest/contribute.html#getting-started)
## Reference to official issue
<!--- If fixing a bug, there should be an existing issue describing it with steps to reproduce -->
<!--- Please link to the issue here: -->
Fix broken links in main documentation #52
## Motivation and Context
<!--- Why is this change required? What problem does it solve? -->
<!--- If adding a new feature or making improvements not already reflected in an official issue, please reference the relevant sections of the design doc -->
Fixing broken links in the Getting Started section of the main documentation page.
## How Has This Been Tested?
<!--- Please describe in detail how you tested your changes. -->
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<!--- see how your change affects other areas of the code, etc. -->
The updated links are working.
## Screenshots (if appropriate):
- [X] I have signed the CLA; if other committers are in the commit history, they have signed the CLA as well