Remove redundant titles

First pass for all titles still using the old '=====' syntax

https://github.com/QubesOS/qubes-issues/issues/6701#issuecomment-862060759

developer/releases/3_0/schedule.md

@@ -8,7 +8,6 @@ ref: 20
 title: Qubes R3.0 Release Schedule
 ---
 
-Qubes R3.0 Release Schedule
 ===========================
 
 |  Date       | Stage                                 |

developer/releases/3_1/schedule.md

@@ -8,7 +8,6 @@ ref: 17
 title: Qubes R3.1 Release Schedule
 ---
 
-Qubes R3.1 Release Schedule
 ===========================
 
 This schedule is based on [Version Scheme](/doc/version-scheme/#release-schedule).

developer/releases/3_2/schedule.md

@@ -8,7 +8,6 @@ ref: 22
 title: Qubes R3.2 Release Schedule
 ---
 
-Qubes R3.2 Release Schedule
 ===========================
 
 This schedule is based on [Version Scheme](/doc/version-scheme/#release-schedule).

developer/releases/4_0/release-notes.md

@@ -7,7 +7,6 @@ ref: 23
 title: Qubes R4.0 release notes
 ---
 
-Qubes R4.0 release notes
 ========================
 
 New features since 3.2

developer/releases/4_0/schedule.md

@@ -8,7 +8,6 @@ ref: 24
 title: Qubes R4.0 Release Schedule
 ---
 
-Qubes R4.0 Release Schedule
 ===========================
 
 This schedule is based on [Version Scheme](/doc/version-scheme/#release-schedule).

developer/releases/notes.md

@@ -7,7 +7,6 @@ ref: 13
 title: Release Notes
 ---
 
-Release Notes
 =============
 
 * [Qubes R1.0 release notes](/doc/releases/1.0/release-notes/)

developer/releases/schedules.md

@@ -7,7 +7,6 @@ ref: 15
 title: Release Schedules
 ---
 
-Release Schedules
 =================
 
 * [Qubes R3.0 release schedule](/doc/releases/3.0/schedule/)

developer/releases/todo.md

@@ -8,7 +8,6 @@ ref: 14
 title: Release Checklist
 ---
 
-Release Checklist
 =================
 
 *the checklist is probably unfinished*