docs: convert alerts to use GitHub Flavored Markdown (GFM) (#16850)

followup to #16761 

thanks @lucasmelin !

+ thanks: @ethanndickson @Parkreiner @matifali @aqandrew 

- [x] update snippet
- [x] find/replace
- [x] spot-check


[preview](https://coder.com/docs/@16761-gfm-callouts/admin/templates/managing-templates/schedule)
(and others)

---------

Co-authored-by: EdwardAngert <17991901+EdwardAngert@users.noreply.github.com>
Co-authored-by: M Atif Ali <atif@coder.com>

docs/admin/setup/appearance.md

@@ -1,11 +1,8 @@
 # Appearance
 
-<blockquote class="info">
-
-Customizing Coder's appearance is an Enterprise and Premium feature.
-[Learn more](https://coder.com/pricing#compare-plans).
-
-</blockquote>
+> [!NOTE]
+> Customizing Coder's appearance is an Enterprise and Premium feature.
+> [Learn more](https://coder.com/pricing#compare-plans).
 
 Customize the look of your Coder deployment to meet your enterprise
 requirements.

docs/admin/setup/index.md

@@ -10,8 +10,7 @@ full list of the options, run `coder server --help` or see our
 external URL that users and workspaces use to connect to Coder (e.g.
 <https://coder.example.com>). This should not be localhost.
 
-> Access URL should be an external IP address or domain with DNS records
-> pointing to Coder.
+Access URL should be an external IP address or domain with DNS records pointing to Coder.
 
 ### Tunnel
 
@@ -44,7 +43,8 @@ coder server
 or running [coder_apps](../templates/index.md) on an absolute path. Set this to
 a wildcard subdomain that resolves to Coder (e.g. `*.coder.example.com`).
 
-> Note: We do not recommend using a top-level-domain for Coder wildcard access
+> [!NOTE]
+> We do not recommend using a top-level-domain for Coder wildcard access
 > (for example `*.workspaces`), even on private networks with split-DNS. Some
 > browsers consider these "public" domains and will refuse Coder's cookies,
 > which are vital to the proper operation of this feature.
@@ -107,6 +107,7 @@ deployment information. Use `CODER_PG_CONNECTION_URL` to set the database that
 Coder connects to. If unset, PostgreSQL binaries will be downloaded from Maven
 (<https://repo1.maven.org/maven2>) and store all data in the config root.
 
+> [!NOTE]
 > Postgres 13 is the minimum supported version.
 
 If you are using the built-in PostgreSQL deployment and need to use `psql` (aka

docs/admin/setup/telemetry.md

@@ -1,8 +1,7 @@
 # Telemetry
 
-<blockquote class="info">
-TL;DR: disable telemetry by setting <code>CODER_TELEMETRY_ENABLE=false</code>.
-</blockquote>
+> [!NOTE]
+> TL;DR: disable telemetry by setting <code>CODER_TELEMETRY_ENABLE=false</code>.
 
 Coder collects telemetry from all installations by default. We believe our users
 should have the right to know what we collect, why we collect it, and how we use