Rename exercises dir

Name it instead "topics" so it won't be
strange if some topics included "exercises" directory.

topics/ansible/solutions/my_first_playbook.md

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+## My first playbook - Solution
+
+1. `vi first_playbook.yml`
+
+```
+- name: Install zlib and create a file
+  hosts: some_remote_host
+  tasks:
+    - name: Install zlib
+      package:
+        name: zlib
+        state: present
+      become: yes
+    - name: Create the file /tmp/some_file
+        path: '/tmp/some_file'
+        state: touch
+```
+
+2. First, edit the inventory file: `vi /etc/ansible/hosts`
+
+```
+[some_remote_host]
+some.remoted.host.com
+```
+
+Run the playbook
+
+`ansible-playbook first_playbook.yml`

topics/ansible/solutions/my_first_task.md

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+## My First Task - Solution
+
+```
+- name: Create a new directory
+  file:
+    path: "/tmp/new_directory"
+    state: directory
+```

topics/ansible/solutions/update_upgrade_task.md

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+## Update and Upgrade apt packages task - Solution
+
+```
+- name: "update and upgrade apt packages."
+  become: yes
+  apt:
+    upgrade: yes
+    update_cache: yes
+```