pages: Add menu contributions guide (#208)

Author: xmnlab

mkdocs.yml

@@ -37,21 +37,24 @@ nav:
       - OSS Internship:
           - index: "opportunities/internships/oss/index.md"
           - Project Ideas: "opportunities/internships/oss/project-ideas/index.md"
-          - Interns Guide: "opportunities/internships/guides/interns/index.md"
-          - Projects Ideas Template: "opportunities/internships/templates/projects-ideas/index.md"
-          - Candidates's Project Proposal Template: "opportunities/internships/templates/candidate-proposal/index.md"
+          - "Contribution Guidelines": "opportunities/guides/contribution/index.md"
+          - "Candidates' Guide": "opportunities/internships/guides/interns/index.md"
+          - "Template: Projects Ideas": "opportunities/internships/templates/projects-ideas/index.md"
+          - "Template: Candidates's Project Proposal": "opportunities/internships/templates/candidate-proposal/index.md"
       - OSS Research Seed Internship:
           - index: "opportunities/internships/oss-research-seed/index.md"
           - Project Ideas: "opportunities/internships/oss-research-seed/project-ideas/index.md"
-          - Interns Guide: "opportunities/internships/guides/interns/index.md"
-          - Projects Ideas Template: "opportunities/internships/templates/projects-ideas/index.md"
-          - Candidates's Project Proposal Template: "opportunities/internships/templates/candidate-proposal/index.md"
+          - "Contribution Guidelines": "opportunities/guides/contribution/index.md"
+          - "Candidates' Guide": "opportunities/internships/guides/interns/index.md"
+          - "Template: Projects Ideas": "opportunities/internships/templates/projects-ideas/index.md"
+          - "Template: Candidates's Project Proposal": "opportunities/internships/templates/candidate-proposal/index.md"
       - Google Summer of Code:
           - index: "opportunities/gsoc/index.md"
           - Project Ideas: "opportunities/gsoc/project-ideas/index.md"
-          - Contributor Guide: "opportunities/gsoc/guides/contributor/index.md"
-          - Project Idea Template: "opportunities/gsoc/templates/project-ideas.md"
-          - Contributor Project Proposal Template: "opportunities/gsoc/templates/contributor-proposal.md"
+          - "Contribution Guidelines": "opportunities/guides/contribution/index.md"
+          - "Candidates' Guide": "opportunities/gsoc/guides/contributor/index.md"
+          - "Template: Project Idea": "opportunities/gsoc/templates/project-ideas.md"
+          - "Template: Candidates Project Proposal": "opportunities/gsoc/templates/contributor-proposal.md"
   - Partnership:
       - index: "partnership/index.md"
       - Partners: "partnership/partners/index.md"