Frontpage update (#179)

This PR introduces an overhaul for the front page and login features while keeping the rest of the application intact.

## Major Changes

- TailwindCSS + DaisyUI Integration: Add  modern CSS framework for component-based utility styling
- Build System: Added pnpm for CSS building; can be extended for updated frontend builds in the future
- Navbar + Footer: Redesigned and includable; old version retained for unstyled elements
- Optimized Assets: Added minified and CSS-stylable logos

## New Features

- Static Pages: Added comprehensive mockups of static pages (legal, privacy policy, terms of use, contact, etc.). **Note:** These have to be fixed before a public release, as their content is largely unreviewed and incorrect. Probably best to do in a separate PR that only contains updates to these.
- Discourse API: Implement minimal features based on RestAPI for controllable results.

## Current bugs
- [x] The static pages include the default navbar and footer on the login page. This will likely not work, as users need to access it before logging in; no good workaround so far (problem with Django templating system).
- [ ] The front page predict link is currently non-functional; the redesigned page is almost ready but better done in a separate PR as it also touches Django code.
- [x] Visual bug with the news cards. Still intend to fix for this PR

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#179
Reviewed-by: jebus <lorsbach@envipath.com>
Co-authored-by: Tobias O <tobias.olenyi@envipath.com>
Co-committed-by: Tobias O <tobias.olenyi@envipath.com>

static/css/daisyui-theme.css

@@ -0,0 +1,84 @@
+/**
+ * DaisyUI Themes - Generated by Style Dictionary
+ * Theme mappings defined in tokens/daisyui-themes.json
+ */
+
+/* Light theme (default) */
+@plugin "daisyui/theme" {
+  name: "envipath";
+  default: true;
+  color-scheme: light;
+
+  --color-base-100: var(--color-neutral-50);
+  --color-base-200: var(--color-neutral-100);
+  --color-base-300: var(--color-neutral-200);
+  --color-base-content: var(--color-neutral-900);
+  --color-primary: var(--color-primary-500);
+  --color-primary-content: var(--color-primary-50);
+  --color-secondary: var(--color-secondary-500);
+  --color-secondary-content: var(--color-secondary-50);
+  --color-accent: var(--color-accent-500);
+  --color-accent-content: var(--color-accent-50);
+  --color-neutral: var(--color-neutral-950);
+  --color-neutral-content: var(--color-neutral-100);
+  --color-info: var(--color-info-500);
+  --color-info-content: var(--color-info-950);
+  --color-success: var(--color-success-500);
+  --color-success-content: var(--color-success-950);
+  --color-warning: var(--color-warning-500);
+  --color-warning-content: var(--color-warning-950);
+  --color-error: var(--color-error-500);
+  --color-error-content: var(--color-error-950);
+
+  /* border radius */
+  --radius-selector: 1rem;
+  --radius-field: 0.25rem;
+  --radius-box: 0.5rem;
+
+  /* base sizes */
+  --size-selector: 0.25rem;
+  --size-field: 0.25rem;
+
+  /* border size */
+  --border: 1px;
+
+  /* effects */
+  --depth: 1;
+  --noise: 0;
+}
+
+/* Dark theme (prefers-color-scheme: dark) */
+@plugin "daisyui/theme" {
+  name: "envipath-dark";
+  prefersdark: true;
+  color-scheme: dark;
+
+  --color-primary: var(--color-primary-400);
+  --color-primary-content: var(--color-neutral-950);
+  --color-secondary: var(--color-secondary-400);
+  --color-secondary-content: var(--color-neutral-950);
+  --color-accent: var(--color-primary-500);
+  --color-accent-content: var(--color-neutral-950);
+  --color-neutral: var(--color-neutral-300);
+  --color-neutral-content: var(--color-neutral-900);
+  --color-base-100: var(--color-neutral-900);
+  --color-base-200: var(--color-neutral-800);
+  --color-base-300: var(--color-neutral-700);
+  --color-base-content: var(--color-neutral-50);
+  --color-info: var(--color-primary-400);
+  --color-info-content: var(--color-neutral-950);
+  --color-success: var(--color-success-400);
+  --color-success-content: var(--color-neutral-950);
+  --color-warning: var(--color-warning-400);
+  --color-warning-content: var(--color-neutral-950);
+  --color-error: var(--color-error-400);
+  --color-error-content: var(--color-neutral-950);
+  --radius-selector: 1rem;
+  --radius-field: 0.25rem;
+  --radius-box: 0.5rem;
+  --size-selector: 0.25rem;
+  --size-field: 0.25rem;
+  --border: 1px;
+  --depth: 1;
+  --noise: 0;
+}