[Cloudflare One] Add PAC file and proxy endpoint tiered limits to account limits (#28771)

* [Gateway] Update proxy endpoints docs with limits, use cases, logging, and beta limitations

* [Gateway] Remove M&A use case and analytics note from proxy endpoints docs

* [Gateway] Remove BYOD use case from proxy endpoints docs

* [Gateway] Fix broken seat management link in billing section

* move billing and logs

* update headers

* [Cloudflare One] Add PAC file and proxy endpoint tiered limits to account limits

Add Enterprise vs non-Enterprise limits for PAC files (50/1,000) and
proxy endpoints (50/500) to the Gateway section of the account limits
page, replacing the previous single proxy endpoints limit of 500.

* [Gateway] Revert changes to proxy endpoints index.mdx

---------

Co-authored-by: ranbel <101146722+ranbel@users.noreply.github.com>

Author: Encore-Encore

src/content/docs/cloudflare-one/account-limits.mdx

@@ -41,7 +41,10 @@ This page lists the default account limits for rules, applications, fields, and
 | DNS locations                             | 250   |
 | Source IP CIDRs per DNS location          | 1,500 |
 | Concurrent streams for HTTP/2 connections | 256   |
-| Proxy endpoints                           | 500   |
+| PAC files (Standard users)                | 50    |
+| PAC files (Enterprise users)              | 1,000 |
+| Proxy endpoints (Standard users)          | 50    |
+| Proxy endpoints (Enterprise users)        | 500   |
 | Source IP CIDRs per proxy endpoint        | 2,000 |
 | Lists                                     | 100   |
 | Entries per list (Standard users)         | 1,000 |