Remove the external theme that we use, replaces with own one

[mooskagh]

• This is me attempting to recreate visually similar website without using the original theme (which is quite complicated)
• Doesn't use SCSS, so works with basic version of Hugo
• Some minor fixes along the way: icons for social media, slightly higher density (e.g. in tables), allow slightly wider content.

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[mooskagh]

Works now, but I plan to go page by page tomorrow to check whether e.g. chess game snippets still work.

[Copilot]

Pull Request Overview

This PR replaces the external “whisper” theme with a custom “leela” theme by removing legacy layout, SCSS, and JS files, introducing streamlined Hugo templates under layouts/blog, and updating front matter with manual summaries.

• Removed all old theme layout, SCSS, and JS files.
• Added new layouts/blog/section.html and layouts/blog/page.html.
• Updated config.toml to switch to the new leela theme and added summary front matter entries.

Reviewed Changes

Copilot reviewed 243 out of 243 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
layouts/blog/single.html	Deleted – legacy single post template removed.
layouts/blog/section.html	Added – provides new blog index layout.
layouts/blog/page.html	Added – provides new single post layout.
layouts/blog/baseof.html	Deleted – legacy blog base template removed.
layouts/_default/baseof.html	Deleted – legacy default base template removed.
config.toml	Updated – theme changed to leela, removed old props.
content/play/configuration/**/*.md	Added summary front matter to key content files.
assets/scss/**	Deleted – removed legacy SCSS components.
assets/js/scripts.js	Deleted – removed legacy JS.

Comments suppressed due to low confidence (3)

layouts/blog/section.html:3

• [nitpick] The CSS class here is title, but in page.html you use blog-title. For consistent styling and maintainability, unify these class names (e.g. both blog-title or both title).

<h1 class="title">{{ .Title }}</h1>

layouts/blog/section.html:1

• There’s no baseof.html in layouts/blog/ or fallback in _default/. Without a base template to wrap these blocks, Hugo won’t render the layouts correctly. Please ensure you add a new baseof.html or reference an existing one.

{{ define "body_classes" }}blog-index{{ end }}

layouts/blog/page.html:8

• [nitpick] The draft-banner markup is duplicated between page.html and section.html. Consider extracting it into a partial (e.g. partials/draft-banner.html) to reduce duplication and simplify future updates.

{{if .Draft}}

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[borg323]

Looks mostly OK, and we can fix any small issues separately.

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