Make home page sections dynamic and configurable (#14)

* Make home page sections dynamic and configurable

* Fix navbar issue when no section is configured + fix next-prev navigator

* Update exampleSite

* Fix next-prev navigator

* Make navbar brand URL context aware

exampleSite/data/sections/projects.yaml

@@ -0,0 +1,61 @@
+# section information
+section:
+  name: Projects
+  enable: true
+  weight: 4
+  showOnNavbar: true
+
+# filter buttons
+buttons:
+- name: All
+  filter: "all"
+- name: Professional
+  filter: "professional"
+- name: Academic
+  filter: "academic"
+- name: Hobby
+  filter: "hobby"
+
+# your projects
+projects:
+- name: Kubernetes
+  logo: images/projects/kubernetes.png
+  role: Contributor
+  timeline: "March 2018 - Present"
+  repo: https://github.com/kubernetes/kubernetes # If your project is a public repo on GitHub, then provide this link. it will show star count.
+  #url: ""  # If your project is not a public repo but it has a website or any external details url then provide it here. don't provide "repo" and "url" simultaneously.
+  summary: Production-Grade Container Scheduling and Management.
+  tags: ["professional", "kubernetes", "cloud"]
+
+- name: Tensorflow
+  logo: images/projects/tensorflow.png
+  role: Developer
+  timeline: "Jun 2018 - Present"
+  repo: https://github.com/tensorflow/tensorflow
+  #url: ""
+  summary: An Open Source Machine Learning Framework for Everyone.
+  tags: ["professional", "machine-learning","academic"]
+
+- name: A sample academic paper
+  role: Team Lead
+  timeline: "Jan 2017 - Nov 2017"
+  url: "https://www.example.com"
+  summary: Lorem ipsum dolor sit amet consectetur adipisicing elit. Sapiente eius reprehenderit animi suscipit autem eligendi esse amet aliquid error eum. Accusantium distinctio soluta aliquid quas placeat modi suscipit eligendi nisi.
+  tags: ["academic","iot"]
+
+- name: Nocode
+  logo: images/projects/no-code.png
+  role: Nothing
+  timeline: "Oct 2019 - Dec 2019"
+  repo: https://github.com/kelseyhightower/nocode
+  #url: ""
+  summary: The best way to write secure and reliable applications. Write nothing; deploy nowhere.
+  tags: ["hobby", "fun"]
+
+- name: Toha
+  logo: images/projects/toha.png
+  role: Owner
+  timeline: "Jun 2019 - Present"
+  repo: https://github.com/hossainemruz/toha
+  summary: A Hugo theme for personal portfolio.
+  tags: ["hobby","hugo","theme","professional"]