Theme update (#7422)

* Fix duplicate YAML keys in front matter

Hugo upgraded its YAML library to a YAML 1.1 compliant version in v0.152.0 (https://github.com/gohugoio/hugo/releases/tag/v0.152.0), which now throws an error on duplicate keys.

This commit fixes that. Note that:

* The old behaviour was to keep the last occurrence of a duplicate key, so that's is the most commin strategy used here.
* But I have also manually inspected and merged some of them.

* Diable aliases

* Remove api section

* Remove assets folder

* Remove authors

* Remove release-notes section

* Remove JSON output from home page to avoid generating search index

* Fix duplicate aliases

* Fix duplicate image

* Re-add deleted author to contributors directory

* Re-add deleted assets folder

Will move the assets from this folder into the directories of the
corresponding guides later, then delete the folder again

* Set sitemap file name to sitemap.xml

This is consistent with the current filename on production
This will later be renamed to sitemap_tech_guides.xml

* Update Hugo to 0.158.0

* Theme update

- Consolidate assets (CSS, JS, etc) into tech-guides-assets folder
- Make left nav menu only show content area related to current page

* Disable SVG minify to avoid navigation icon rendering bug

* Update Hugo to 0.159.0

* Fix markdown links to missing /docs/api/ pages

* Vale fix

* Vale fix

* Vale fix

* Vale fix

* Vale fix

* Update _build keyword to _build

* Update to Hugo 0.159.1

* Incorporate SVG minification patch

* Update blueberry to recognize the build frontmatter

---------

Co-authored-by: Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>

Author: nmelehan-akamai

CONTRIBUTING.md

@@ -70,18 +70,18 @@ To Install the latest Node.js LTS release on Windows, navigate to the [downloads
 
 ### Install Hugo
 
-The Linode documentation library is built using [Hugo](http://gohugo.io), an open-source static site generator. In order to preview your guide before submission, you need to install Hugo on your local computer. This site currently uses **Hugo v0.139.0**. To remain consistent in the testing and development process, it's recommended to install this version instead of using a newer version.
+The Linode documentation library is built using [Hugo](http://gohugo.io), an open-source static site generator. In order to preview your guide before submission, you need to install Hugo on your local computer. This site currently uses **Hugo v0.159.1**. To remain consistent in the testing and development process, it's recommended to install this version instead of using a newer version.
 
 Note: If you observe any issues on a newer version, please [file an issue](https://github.com/linode/docs/issues) in the docs GitHub repository.
 
 #### macOS and Linux
 
 To install Hugo, download the appropriate binary for your system, extract it, and move it to a directory within your PATH.
 
-1.  Download the file below that corresponds with the OS and platform on your local system. If you don't see your system on this list, you can find additional files on the [Hugo v0.139.0 GitHub release page](https://github.com/gohugoio/hugo/releases/tag/v0.139.0) under **Assets**.
+1.  Download the file below that corresponds with the OS and platform on your local system. If you don't see your system on this list, you can find additional files on the [Hugo v0.159.1 GitHub release page](https://github.com/gohugoio/hugo/releases/tag/v0.159.1) under **Assets**.
 
-    - **macOS:** https://github.com/gohugoio/hugo/releases/download/v0.139.0/hugo_extended_0.139.0_darwin-universal.tar.gz
-    - **Linux:** https://github.com/gohugoio/hugo/releases/download/v0.139.0/hugo_extended_0.139.0_Linux-64bit.tar.gz
+    - **macOS:** https://github.com/gohugoio/hugo/releases/download/v0.159.1/hugo_extended_0.159.1_darwin-universal.tar.gz
+    - **Linux:** https://github.com/gohugoio/hugo/releases/download/v0.159.1/hugo_extended_0.159.1_Linux-64bit.tar.gz
 
     You can download this file through a terminal using the curl command, replacing [url] with the URL for your platform:
 
@@ -115,7 +115,7 @@ To install Hugo, download the appropriate binary for your system, extract it, an
 
 While macOS and Linux are preferred by most of the core Linode Docs team, it's also possible to use Hugo on Windows.
 
-1.  Download the [hugo_extended_0.139.0_windows-amd64.zip](https://github.com/gohugoio/hugo/releases/download/v0.139.0/hugo_extended_0.139.0_windows-amd64.zip) file. Additional files for other operating systems can be found on the [Hugo v0.139.0 GitHub release page](https://github.com/gohugoio/hugo/releases/tag/v0.139.0) under **Assets**.
+1.  Download the [hugo_extended_0.159.1_windows-amd64.zip](https://github.com/gohugoio/hugo/releases/download/v0.159.1/hugo_extended_0.159.1_windows-amd64.zip) file. Additional files for other operating systems can be found on the [Hugo v0.159.1 GitHub release page](https://github.com/gohugoio/hugo/releases/tag/v0.159.1) under **Assets**.
 
 1.  Extract the file to the directory you'd like to install Hugo under, such as `C:\Hugo\bin`.
 
@@ -184,10 +184,10 @@ For more information about using Git, refer to the [official Git documentation](
 
 This section is only relevant to contributors who have previously worked on the docs repo prior to the Tailwind v3 upgrade (which occurred on July 6th, 2023 in docs release v1.252.0). After you merge in changes from this release (and onward), you will likely notice display issues when previewing the site locally. This is due to Tailwind v3 and the way it integrates with Hugo (and our theme). To complete the upgrade locally and fix any display issues, follow the steps below.
 
-1.  Upgrade Hugo to v0.139.0. On macOS, run the following commands in a temporary folder (not in your docs repo):
+1.  Upgrade Hugo to v0.159.1. On macOS, run the following commands in a temporary folder (not in your docs repo):
 
-        curl -OL https://github.com/gohugoio/hugo/releases/download/v0.139.0/hugo_extended_0.139.0_darwin-universal.tar.gz
-        tar -xvzf hugo_extended_0.139.0_darwin-universal.tar.gz
+        curl -OL https://github.com/gohugoio/hugo/releases/download/v0.159.1/hugo_extended_0.159.1_darwin-universal.tar.gz
+        tar -xvzf hugo_extended_0.159.1_darwin-universal.tar.gz
         mv hugo /usr/local/bin
 
     If you are using a different operating system, refer to the [Install Hugo](#install-hugo) section above.