Fix dead links in CONTRIBUTING.md

Author: olivier-lando

CONTRIBUTING.md

@@ -21,7 +21,7 @@ The following is a set of guidelines for contributing to api.video and its packa
     - [Git commit messages](#git-commit-messages)
     - [Documentation style guide](#documentation-style-guide)
   - [Additional notes](#additional-notes)
-    - [Issue and pull request Llabels](#issue-and-pull-request-llabels)
+    - [Issue and pull request labels](#issue-and-pull-request-labels)
       - [Type of issue and issue state](#type-of-issue-and-issue-state)
       - [Topic categories](#topic-categories)
       - [Pull request labels](#pull-request-labels)
@@ -113,8 +113,8 @@ The process described here has several goals:
 
 Please follow these steps to have your contribution considered by the maintainers:
 
-1. Follow all instructions in [the template](PULL_REQUEST_TEMPLATE.md)
-2. Follow the [styleguides](#styleguides)
+1. Follow all instructions in [the template](https://github.com/apivideo/.github/blob/main/PULL_REQUEST_TEMPLATE.md)
+2. Follow the [style guides](#style-guides)
 3. After you submit your pull request, verify that all [status checks](https://help.github.com/articles/about-status-checks/) are passing <details><summary>What if the status checks are failing?</summary>If a status check is failing, and you believe that the failure is unrelated to your change, please leave a comment on the pull request explaining why you believe the failure is unrelated. A maintainer will re-run the status check for you. If we conclude that the failure was a false positive, then we will open an issue to track that problem with our status check suite.</details>
 
 While the prerequisites above must be satisfied prior to having your pull request reviewed, the reviewer(s) may ask you to complete additional design work, tests, or other changes before your pull request can be ultimately accepted.
@@ -150,7 +150,7 @@ While the prerequisites above must be satisfied prior to having your pull reques
 
 ## Additional notes
 
-### Issue and pull request Llabels
+### Issue and pull request labels
 
 This section lists the labels we use to help us track and manage issues and pull requests on all api.video repositories.