Add Theme Switcher

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diff --git a/content/overview-math/index.md b/content/overview-math/index.md
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-+++
-title = "Mathematical Notations"
-description = "Sample article showcasing the display of Mathematical Notations, made possible by the KaTeX library."
-date = 2021-05-05
-updated = 2022-01-01
-[taxonomies]
-categories = ["Features"]
-tags = ["shortcodes","Mathematics"]
-[extra]
-math = true
-math_auto_render = true
-keywords = "Math, Matematics, Notation, KaTeX, Mathematical Notation"
-+++
-
-You can use [KaTeX](https://katex.org) to render mathematical notations.
-
-You can enable the $\KaTeX$ support globally, per-section or per-page basis.
-<!-- more -->
-# CSP Note
-
-KaTeX unfortunately requires `script-src 'unsafe-inline'` in the Content Security Policy. This is a security vulnerability, so this page will not render KaTeX correctly because this demo site uses best security practices. I have taken a picture below to show you what some of these formulas look like should you enable KaTeX.
-
-KaTeX js is designed to work even with dynamic content, but because Zola is a SSG it seems to me the best solution is to avoid using this javascript all-together, process our markdown files similar to how KaTeX autorender does, but do it during zola build. insert some `<span class="KaTeX_Main">` ...etc so that we basically render it during the build process. If complex mathematics were part of my daily life then I might be motivated to write such code for Zola.
-
-You will also see this page rendered correctly if you git clone this repo and use `zola serve` because then there will be no Content Security Policy in place.
-
-{{ img(src="katex.png" alt="KaTeX" w=568 h=1014) }}
-
-## Enable Globally
-
-To enable the $\KaTeX$ support globally, add `math = true` under `[extra]` of the `config.toml`
-at your site root. Now the katex shortcode will be rendered, you can also add `math_auto_render = true`
-and every section and page of your site will load the KaTeX [autorender extension](https://katex.org/docs/autorender.html).
-
-```toml
-[extra]
-math = true
-math_auto_render = false
-```
-
-## Per-section Basis
-
-To enable the $\KaTeX$ support in a particular section, add `math = true` under `[extra]` in the `[SECTION_NAME]/_index.md`.
-Now the katex shortcode will be rendered, you can also add `math_auto_render = true`
-and the section of your site will load the KaTeX [autorender extension](https://katex.org/docs/autorender.html).
-
-```toml
-+++
-[extra]
-math = true
-+++
-```
-
-## Per-page Basis
-
-To enable the $\KaTeX$ support in a particular page, add `math = true` under `[extra]` in the page's
-frontmatter. Now the katex shortcode will be rendered, you can also add `math_auto_render = true`
-and the page of your site will load the KaTeX [autorender extension](https://katex.org/docs/autorender.html).
-
-```toml
-+++
-[extra]
-math = true
-math_auto_render = true
-+++
-```
-
-It is a good practice to enable $\KaTeX$ support on a per-page basis, since this will only load the
-required files on that particular page, without affecting the page load speed of other pages.
-If your site is not math-heavy, please do NOT enable this feature globally or per-section basis.
-
-## Usage
-
-Wrap any [valid](https://katex.org/docs/supported.html) $\KaTeX$ syntax with `$...$` for inline
-Mathematics and `$$...$$` for block Mathematics.
-
-### Inline Mathematics
-
-This is the most beautiful equation I've ever seen:
-
-### Usage
-```rs
-{%/* katex(block=false) */%} e^{i\pi}+1=0 {%/* end */%}
-```
-### Output
-```html
-{% katex(block=false) %} e^{i\pi}+1=0 {% end %}
-```
-{% katex(block=false) %} e^{i\pi}+1=0 {% end %}
-
-### Block Mathematics
-
-Some Mathematics in display mode is fair enough:
-
-### Usage
-```rs
-{%/* katex(block=true) */%} \int_0^1 x^2 dx {%/* end */%}
-```
-### Output
-```html
-{% katex(block=true) %} \int_0^1 x^2 dx {% end %}
-```
-{% katex(block=true) %} \int_0^1 x^2 dx {% end %}
-
-### Auto Render Inline Example
-```
-$ e^{i\pi}+1=0 $
-```
-
-$ e^{i\pi}+1=0 $
-
-### Auto Render Block Example
-```
-$$
-f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
-$$
-```
-
-$$
-f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
-$$
diff --git a/content/overview-math/katex.png b/content/overview-math/katex.png
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