maint: Update npm packages

Use this command to automatically update & install without conflicts.

```bash
npm update --save && npm install
```

Updating to latest versions may result in dependency conflicts and
errors in packages.

Use this command to update packages to latest versions.

```bash
npx npm-check-updates -u && npm install
```

Use this command to check outdate packages

```bash
npm outdated
```

Fix timezone issues

CV Layout improvements

Features (Breaking changes not compatible with previous CV layout)

* Add cv-description class to replace post-meta class in cv layout to
  keep it separate from post layout. This class is similar to post-meta
  class except for text color which is set to normal instead of accent.
* Remove bottom border in cv-experience to avoid printing too many lines
  due to many experiences listed. These lines are a distraction when
  reading the CV.
* Remove cv-skills class and cv/skills shortcode replace it with simple
  line e.g. "Skills: C++, Python". This is done to reduce the printed
  content.
* Add cv-content class to apply cv content specific styles:
  + Reduce h2 size as it is not more important than the listed
    experiences and educations.
  + Reduce line height and margins for all elements under cv-content to
    keep the CV readable in print while also fitting into smallest page
    area.

Fix: Remove ad styles from theme styles

Use static css to define site local ad styles.

Fix: [CV] Reduce wasting space in first page

Feature: Improve CV layout template

Feature:

* [CV] Add updated on date and description.

Fixes:

* [CV] Move languages to top in skills
* [layout] Replace address with div

Fix: Slides header, TOC lists, highlight wrapper

* Add header section with title, date, author and description to slides.
* Remove bottom margin for lists in table of contents (TOC). This is
  done to prevent empty space between list items when there are multiple
  levels in table of contents (TOC).
* Reuse highlight wrapper. This change enables reusing highlight wrapper
  for components without the toolbar and copy buttons e.g. slides.

Embedded reveal.js slides with hugo-xterm colors

Features:

* Embedded reveal.js slides with hugo-xterm colors.

Refactor:

* Remove blocks: "head", "styles", "container" and "scripts" as they are
  better implemented by partials and keep the layouts consistent across
  theme components default, CV and slides.
* Remove styles from 'slides/style.html' and move them into SASS partial
  'styles/_slides.scss'. Import the partial in 'styles/app.scss'.

Fixes:

* Use site params for copyright text in slides footer.
* Remove function to get color for media print in styles.

Next:

* External reveal.js theme 'black' must be removed in future as now it
  breaks theme UI.

improve: Remove canonifyURLs, use absURL

Hugo configuration `canonifyURLs` is a brute force approach to search
for relative URLs with a leading slash and then prepend them with the
baseURL to create absolute URLs after the page is rendered. This
approach is slow and confusing and will be removed in future from Hugo.

Use `absURL` template function in theme layouts to replace
`canonifyURLs`. To support the base URLs with sub directories remove
leading slash in relative URLs.

Fixes: #1 | Blog Footer and header URL's don't seem to follow base path

feat: Add styles for ads, extend head & footer