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/experiences.yaml

@@ -0,0 +1,51 @@
+# section information
+section:
+  name: Experiences
+  enable: true
+  weight: 3
+  showOnNavbar: true
+
+
+# Your experiences
+experiences:
+- designation: Software Engineer
+  company:
+    name: Example Co.
+    url: "https://www.example.com"
+    location: Dhaka Branch
+    # company overview
+    overview: Example Co. is a widely recognized company for cloud-native development. It builds tools for Kubernetes.
+  start: Nov 2017
+  # don't provide end date if you are currently working there. It will be replaced by "Present"
+  # end: Dec 2020
+  # give some points about what was your responsibilities at the company.
+  responsibilities:
+  - Design, develop and manage disaster recovery tool [Xtool](https://www.example.com) that backup Kubernetes volumes, databases, and cluster's resource definition.
+  - My another responsibility.
+  - My more responsibilities.
+
+- designation: Software Engineer
+  company:
+    name: PreExample Co.
+    url: "https://www.preexample.com"
+    location: Nowhere
+    overview: PreExample Co. is a gateway company to enter into Example co. So, nothing special here.
+  start: March 2016
+  end: May 2017
+  responsibilities:
+  - Write lots of example codes.
+  - Read lots of examples.
+  - See lots of example videos.
+
+- designation: Intern
+  company:
+    name: Intern Counting Company (ICC).
+    url: "https://www.intern.com"
+    location: Intern Land
+    overview: Intern counting Company (ICC) is responsible for counting worldwide intern Engineers.
+  start: Jun 2015
+  end: Jan 2016
+  responsibilities:
+  - Count lost of interns.
+  - Count more interns.
+  - Count me as an intern.