fix: resolve CSS autoprefixer warning and broken links

- Update display: box to display: -webkit-box with proper prefixes in video-title class
- Fix /providers/index link to /providers in index.mdx
- Fix /roo-code-cloud/credits links to /roo-code-cloud/billing-subscriptions

Author: hannesrudolph

docs/index.mdx

@@ -37,7 +37,7 @@ The two options are highly complementary and built on the same shared foundation
 
 The most successful Roo users tend to embrace the following ideas:
 
-- **Leverage model agnosticism:** Roo isn't an LLM model, it needs an [LLM provider](/providers/index) to work. But it's compatible with dozens of providers and hundreds of models, so you're free to experiment, optimize and switch around, by design. No lock-ins in a world where "the best model" changes every other week.
+- **Leverage model agnosticism:** Roo isn't an LLM model, it needs an [LLM provider](/providers) to work. But it's compatible with dozens of providers and hundreds of models, so you're free to experiment, optimize and switch around, by design. No lock-ins in a world where "the best model" changes every other week.
 - **Don't skimp on tokens:** expensive state-of-the-art models with lots of tokens will almost always beat cheap models using few tokens. Pay attention to your budget, but embrace the fact that tokens are cheaper than developer time.
 - **Trust roles:** The extension's customizable Modes (Architect, Code, etc) and the pre-defined Cloud Agent Types (Planner, Coder, etc) keep the models on track and focused on the task at hand, without stepping outside of their boundaries. Lean on them depending on the task you're working on.
 - **Be ambitious:** Roo works best the more you trust it. Out-of-the-box, the Extension will ask for your permission to everything, but as you become more comfortable and enable [Auto-Approve](/features/auto-approving-actions), you'll see it work for long periods on its own without getting stuck or making bad decisions. Once ready, throw large, complex projects at the [Orchestrator](/basic-usage/using-modes#orchestrator-mode-aka-boomerang-mode), who will coordinate tasks across Modes. In the Cloud, we handle all of this for you.

docs/providers/roo-code-cloud.md

@@ -54,7 +54,7 @@ We curate the best models for coding and offer them directly to you.
 
 ## Pricing & Credits
 
-Roo Code Cloud operates on a [Credit System](/roo-code-cloud/credits).
+Roo Code Cloud operates on a [Credit System](/roo-code-cloud/billing-subscriptions).
 - **Promotional Period**: Currently, all standard usage for the models listed above is **100% FREE**.
 - **Future Pricing**: We will introduce a transparent credit-based system for usage beyond the free tier. You will always be notified before any charges apply.
 

docs/roo-code-cloud/cloud-agents.mdx

@@ -111,7 +111,7 @@ Cloud Agents consume **Cloud Credits**. Usage is measured based on the model use
 - **Free Tier:** Includes access to free models for standard tasks.
 - **Pro Tier:** Unlocks concurrent agent execution and priority queueing.
 
-There's a [whole page about credits](/roo-code-cloud/credits) if you want to learn more.
+There's a [whole page about credits](/roo-code-cloud/billing-subscriptions) if you want to learn more.
 
 ### Settings
 

src/css/custom.css

@@ -349,9 +349,9 @@ div[style*="min-height:100vh"] {
 .video-title {
   font-weight: 500;
   color: var(--ifm-heading-color);
-  display: box;
-  line-clamp: 2;
-  box-orient: vertical;
+  display: -webkit-box;
+  -webkit-line-clamp: 2;
+  -webkit-box-orient: vertical;
   overflow: hidden;
   line-height: 1.4;
   max-height: 2.8em; /* 2 lines * 1.4 line-height */