Improves the file structure in the codebase for better understanding

[Murdock9803]

Fixes

• Fixes [Feature] The file structure in the repository can be improved. #287 by @Murdock9803

Description

The pull request aims at Re-structuring the site with the help of various actions like shifting some files into single folders, renaming some files to better follow the structure of the repository, and also by refactoring some code to accompany the changes.

Technical details

The pull request does the following tasks:

• make a new directory in docs/ named _assets and include it in the _config.yml file.
• in the _assets directory, shift the vocabulary directory, the downloads folder, the images folder and the css folder.
• shift the style.css file in the _assets/css folder.
• update all the relative paths to style.css. vocabulary, images and downloads.
• delete the images/assets folder as it is no longer in use since the inclusion of vocabulary.
• delete the favicon.ico file from docs/, and include the favicon from vocabulary in the site's pages.
• modify the path to image-thumb and image-full in all the pages in the _resources directory.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

Developer Certificate of Origin

For the purposes of this DCO, "license" is equivalent to "license or public domain dedication," and "open source license" is equivalent to "open content license or public domain dedication."

Developer Certificate of Origin

Developer Certificate of Origin
Version 1.1

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Developer's Certificate of Origin 1.1

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(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
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    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

[possumbilities]

Looks great! Nicely done!
Approved.