Use inline HTML for heading tags, not Gitiles MD

This syntax for creating ID tags for headings (typcially with complex
names) isn't supported in CommonMark, which is the standard used by our
MD linter. It's valid syntax in Gitiles MD, which is why the links work.

Upstream feature request to add support for this type of header ID:
DavidAnson/markdownlint#570

This is required for submariner-io#827.

Signed-off-by: Daniel Farrell <dfarrell@redhat.com>

src/content/development/release-process/_index.en.md

@@ -308,7 +308,7 @@ Once the `submariner-operator` and `submariner-charts` releases are complete, we
    unpin the Shipyard Dapper base image version, that is set it back to `devel`. For ongoing development we want each project to
    automatically pick up the latest changes to the base image.
 
-### Step 5: Verify Release {id="verify"}
+### Step 5: Verify Release <a id="verify"></a>
 
 You can follow any of the [quick start guides](../../getting-started/quickstart).
 

src/content/development/shipyard/targets/_index.en.md

@@ -58,7 +58,7 @@ make deploy
 * **`DEPLOYTOOL`**: The tool used to deploy Submariner itself (defaults to `operator`).
 * **`LIGHTHOUSE`**: Deploys Lighthouse in addition to the basic Submariner deployment (defaults to `false`).
 
-### E2E (End to End) {#e2e}
+### E2E (End to End) <a id="e2e"></a>
 
 Runs end to end testing on the deployed environment (if one isn't created yet, this target will first invoke the `deploy` target to do so).
 The tests are taken from the project, unless it has no specific end to end tests, in which case generic testing using `subctl verify` is